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[css-text-3] Don't mince words about aliasing/shorthands with word-wrap · Issue #866 · w3c/csswg-drafts · GitHub
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word-wrap","url":"https://github.com/w3c/csswg-drafts/issues/866","viewerCanUpdateNext":false,"issueType":null,"state":"CLOSED","stateReason":"COMPLETED","duplicateOf":null,"linkedPullRequests":{"nodes":[{"repository":{"nameWithOwner":"w3c/csswg-drafts","id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","login":"w3c","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg=="}},"state":"MERGED","isDraft":false,"url":"https://github.com/w3c/csswg-drafts/pull/3110","number":3110,"id":"MDExOlB1bGxSZXF1ZXN0MjE1NTE1MTAx"}]},"subIssuesSummary":{"total":0,"completed":0},"__isLabelable":"Issue","labels":{"edges":[{"node":{"id":"MDU6TGFiZWwzOTU3ODU5Njk=","color":"0e8a16","name":"Closed Accepted by CSSWG Resolution","nameHTML":"Closed Accepted by CSSWG 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tests","url":"https://github.com/w3c/csswg-drafts/labels/Tested","__typename":"Label"},"cursor":"NQ"},{"node":{"id":"MDU6TGFiZWw4NTYwNjY0MTg=","color":"aaaaaa","name":"Tracked in DoC","nameHTML":"Tracked in DoC","description":"","url":"https://github.com/w3c/csswg-drafts/labels/Tracked%20in%20DoC","__typename":"Label"},"cursor":"Ng"}],"pageInfo":{"endCursor":"Ng","hasNextPage":false}},"__isNode":"Issue","assignees":{"nodes":[{"id":"MDQ6VXNlcjExMzI2OA==","login":"frivoal","name":"Florian Rivoal","avatarUrl":"https://avatars.githubusercontent.com/u/113268?s=64\u0026u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e\u0026v=4"}]},"milestone":null,"databaseId":199302582,"viewerDidAuthor":false,"locked":false,"author":{"__typename":"User","__isActor":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY=","profileUrl":"https://github.com/Manishearth","avatarUrl":"https://avatars.githubusercontent.com/u/1617736?u=3c160b4a66ca211ea091b90c00252f4561582680\u0026v=4"},"__isComment":"Issue","body":"https://drafts.csswg.org/css-text-3/#propdef-word-wrap\r\n\r\nThe spec says:\r\n\r\n\u003e For legacy reasons, UAs must treat word-wrap as an alternate name for the overflow-wrap property, as if it were a shorthand of overflow-wrap.\r\n\r\nThe \"as if it were a shorthand\" is a bit hand-wavy, especially since \"as an alternate name\" can mean something else.\r\n\r\nIn particular, we have two different ways of \"aliasing\" properties. One is by making them shorthands of the aliasee. The other is by making them redirect to the other property at parse time.\r\n\r\nThe difference crops up when doing things like serializing property declaration blocks. For example, the following CSS:\r\n\r\n```css\r\n #foo {\r\n word-wrap: break-word;\r\n overflow-wrap: break-word;\r\n align-items: flex-end;\r\n -webkit-align-items: baseline;\r\n foobar: baz;\r\n }\r\n```\r\n\r\nwhen serialized via `document.styleSheets[0].cssRules[0].cssText` in Firefox produces `\"#foo { overflow-wrap: break-word; align-items: baseline; }\"`, whereas in Chrome/Safari it produces `\"#foo { word-wrap: break-word; overflow-wrap: break-word; align-items: baseline; }\"`. This means that Firefox implements it as a \"redirect alias\", but Chrome/Safari implement it as a shorthand alias. All of them handle `-webkit-align-items` as a \"redirect alias\".\r\n\r\nBrowsers already use \"redirect aliases\" consistently for aliasing legacy prefixed properties. This concept of an alias is not defined in the spec, but is consistently implemented in browsers as something akin to:\r\n\r\nIf `foo` is an alias for property `bar`:\r\n\r\n - At parse time, if you encounter a property of name `foo`, treat it as if it were the name you encountered was of property `bar`\r\n - In CSSStyleDeclaration add accessors for the alias `foo` that under the hood work with property `bar`\r\n - Nowhere else should there be traces of the name `foo` (including during serialization of a declaration block)\r\n\r\n\r\nThe [compat spec _uses_ this concept of \"aliasing\"](https://compat.spec.whatwg.org/#css-simple-aliases), but does not define it.\r\n\r\nWe should either explicitly spec `word-wrap` to be a shorthand, or define this other concept of property alias in the spec and use it here (and also use it in the compat spec). I personally prefer the latter solution since aliasing is currently unspecced but imo shouldn't be, and because this is the only case where a shorthand is used for aliasing.\r\n\r\n\r\ncc @dholbert @dbaron @fantasai \r\n","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca href=\"https://drafts.csswg.org/css-text-3/#propdef-word-wrap\" rel=\"nofollow\"\u003ehttps://drafts.csswg.org/css-text-3/#propdef-word-wrap\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe spec says:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eFor legacy reasons, UAs must treat word-wrap as an alternate name for the overflow-wrap property, as if it were a shorthand of overflow-wrap.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe \"as if it were a shorthand\" is a bit hand-wavy, especially since \"as an alternate name\" can mean something else.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn particular, we have two different ways of \"aliasing\" properties. One is by making them shorthands of the aliasee. The other is by making them redirect to the other property at parse time.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe difference crops up when doing things like serializing property declaration blocks. For example, the following CSS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\" #foo {\n word-wrap: break-word;\n overflow-wrap: break-word;\n align-items: flex-end;\n -webkit-align-items: baseline;\n foobar: baz;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e \u003cspan class=\"pl-kos\"\u003e#\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003efoo\u003c/span\u003e {\n \u003cspan class=\"pl-c1\"\u003eword-wrap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e break-word;\n \u003cspan class=\"pl-c1\"\u003eoverflow-wrap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e break-word;\n \u003cspan class=\"pl-c1\"\u003ealign-items\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e flex-end;\n \u003cspan class=\"pl-c1\"\u003e-webkit-align-items\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e baseline;\n \u003cspan class=\"pl-c1\"\u003efoobar\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e baz;\n }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewhen serialized via \u003ccode class=\"notranslate\"\u003edocument.styleSheets[0].cssRules[0].cssText\u003c/code\u003e in Firefox produces \u003ccode class=\"notranslate\"\u003e\"#foo { overflow-wrap: break-word; align-items: baseline; }\"\u003c/code\u003e, whereas in Chrome/Safari it produces \u003ccode class=\"notranslate\"\u003e\"#foo { word-wrap: break-word; overflow-wrap: break-word; align-items: baseline; }\"\u003c/code\u003e. This means that Firefox implements it as a \"redirect alias\", but Chrome/Safari implement it as a shorthand alias. All of them handle \u003ccode class=\"notranslate\"\u003e-webkit-align-items\u003c/code\u003e as a \"redirect alias\".\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBrowsers already use \"redirect aliases\" consistently for aliasing legacy prefixed properties. This concept of an alias is not defined in the spec, but is consistently implemented in browsers as something akin to:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf \u003ccode class=\"notranslate\"\u003efoo\u003c/code\u003e is an alias for property \u003ccode class=\"notranslate\"\u003ebar\u003c/code\u003e:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAt parse time, if you encounter a property of name \u003ccode class=\"notranslate\"\u003efoo\u003c/code\u003e, treat it as if it were the name you encountered was of property \u003ccode class=\"notranslate\"\u003ebar\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eIn CSSStyleDeclaration add accessors for the alias \u003ccode class=\"notranslate\"\u003efoo\u003c/code\u003e that under the hood work with property \u003ccode class=\"notranslate\"\u003ebar\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eNowhere else should there be traces of the name \u003ccode class=\"notranslate\"\u003efoo\u003c/code\u003e (including during serialization of a declaration block)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"https://compat.spec.whatwg.org/#css-simple-aliases\" rel=\"nofollow\"\u003ecompat spec \u003cem\u003euses\u003c/em\u003e this concept of \"aliasing\"\u003c/a\u003e, but does not define it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe should either explicitly spec \u003ccode class=\"notranslate\"\u003eword-wrap\u003c/code\u003e to be a shorthand, or define this other concept of property alias in the spec and use it here (and also use it in the compat spec). I personally prefer the latter solution since aliasing is currently unspecced but imo shouldn't be, and because this is the only case where a shorthand is used for aliasing.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ecc \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/dholbert/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/dholbert\"\u003e@dholbert\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/dbaron/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/dbaron\"\u003e@dbaron\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/fantasai/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/fantasai\"\u003e@fantasai\u003c/a\u003e\u003c/p\u003e","bodyVersion":"ac425eb0fc5e76d18fea740e0129738c954dd7fc4b803286e3fb7ec5422de96d","createdAt":"2017-01-06T22:09:10Z","__isReactable":"Issue","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"viewerCanUpdateMetadata":false,"viewerCanComment":false,"viewerCanAssign":false,"viewerCanLabel":false,"__isIssueOrPullRequest":"Issue","projectItemsNext":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"viewerCanSetMilestone":false,"isPinned":false,"viewerCanDelete":false,"viewerCanTransfer":false,"viewerCanConvertToDiscussion":false,"viewerCanLock":false,"viewerCanType":false,"frontTimelineItems":{"pageInfo":{"hasNextPage":true,"endCursor":"Y3Vyc29yOnYyOpPPAAABYfWmZBABqjE1MDM3NTUzMzg="},"totalCount":57,"edges":[{"node":{"__typename":"CrossReferencedEvent","__isIssueTimelineItems":"CrossReferencedEvent","__isTimelineEvent":"CrossReferencedEvent","databaseId":270646306,"createdAt":"2017-01-06T22:12:43Z","actor":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY=","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/1617736?s=64\u0026u=3c160b4a66ca211ea091b90c00252f4561582680\u0026v=4"},"source":{"__typename":"PullRequest","__isNode":"PullRequest","id":"MDExOlB1bGxSZXF1ZXN0MTAwNTEwOTgx"},"willCloseTarget":false,"referencedAt":"2017-01-06T22:12:43Z","target":{"__typename":"Issue","repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4"},"__isNode":"Issue","id":"MDU6SXNzdWUxOTkzMDI1ODI="},"innerSource":{"__typename":"PullRequest","__isReferencedSubject":"PullRequest","id":"MDExOlB1bGxSZXF1ZXN0MTAwNTEwOTgx","pullTitleHTML":"Support property aliases","url":"https://github.com/servo/servo/pull/14893","number":14893,"state":"MERGED","isDraft":false,"isInMergeQueue":false,"repository":{"id":"MDEwOlJlcG9zaXRvcnkzMzkwMjQz","name":"servo","isPrivate":false,"owner":{"__typename":"Organization","login":"servo","id":"MDEyOk9yZ2FuaXphdGlvbjI1NjYxMzU="}},"__isNode":"PullRequest"},"__isNode":"CrossReferencedEvent","id":"MDIwOkNyb3NzUmVmZXJlbmNlZEV2ZW50MjcwNjQ2MzA2"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXXU3gCqTI3MDY0NjMwNg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271024347,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"dholbert","avatarUrl":"https://avatars.githubusercontent.com/u/426803?v=4","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTAyNDM0Nw==","body":"For reference, [here's a link to where Firefox implemented this property as an alias](https://bugzilla.mozilla.org/show_bug.cgi?id=955857) (rather than a shorthand). I think we could just as easily implement it as a shorthand if it were clearly specced as such, though I agree with @Manishearth that an alias seems strictly simpler \u0026 more appropriate for legacy stuff (if aliases are a speccable concept).","bodyHTML":"\u003cp dir=\"auto\"\u003eFor reference, \u003ca href=\"https://bugzilla.mozilla.org/show_bug.cgi?id=955857\" rel=\"nofollow\"\u003ehere's a link to where Firefox implemented this property as an alias\u003c/a\u003e (rather than a shorthand). I think we could just as easily implement it as a shorthand if it were clearly specced as such, though I agree with \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/Manishearth/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/Manishearth\"\u003e@Manishearth\u003c/a\u003e that an alias seems strictly simpler \u0026amp; more appropriate for legacy stuff (if aliases are a speccable concept).\u003c/p\u003e","bodyVersion":"4bc57a3d8c0ead92a4d1b360aa686280ad94cb45bb9e8d2238ca070dae2ba05d","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271024347","createdAt":"2017-01-06T22:14:38Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2017-01-06T22:16:22Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/dholbert","login":"dholbert","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDE1OlVzZXJDb250ZW50RWRpdDE0MjA0NDA0"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXZFLAAqTI3MTAyNDM0Nw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271028230,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"dbaron","avatarUrl":"https://avatars.githubusercontent.com/u/248721?v=4","id":"MDQ6VXNlcjI0ODcyMQ=="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTAyODIzMA==","body":"I'd also note that the normal rules for shorthands would produce a third result that is both (a) undesirable and (b) neither the Firefox nor the Chrome result, i.e., serializing the above rule to: \u003ccode\u003e\"#foo { word-wrap: break-word; align-items: baseline; }\"\u003c/code\u003e, since it's possible to \"condense\" the declaration into a shorthand.\r\n\r\nThis is by the same principle that:\r\n```js\r\ndocument.body.style.borderLeftColor = \"green\";\r\ndocument.body.style.borderLeftWidth = \"medium\";\r\ndocument.body.style.borderLeftStyle = \"dotted\";\r\nconsole.log(document.body.getAttribute('style'));\r\n```\r\nproduces:\r\n```\r\nborder-left: medium dotted green;\r\n```\r\nin both Firefox and Chrome.\r\n\r\nI think that also suggests that we need to specify the concept of aliases.","bodyHTML":"\u003cp dir=\"auto\"\u003eI'd also note that the normal rules for shorthands would produce a third result that is both (a) undesirable and (b) neither the Firefox nor the Chrome result, i.e., serializing the above rule to: \u003ccode class=\"notranslate\"\u003e\"#foo { word-wrap: break-word; align-items: baseline; }\"\u003c/code\u003e, since it's possible to \"condense\" the declaration into a shorthand.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is by the same principle that:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"document.body.style.borderLeftColor = \u0026quot;green\u0026quot;;\ndocument.body.style.borderLeftWidth = \u0026quot;medium\u0026quot;;\ndocument.body.style.borderLeftStyle = \u0026quot;dotted\u0026quot;;\nconsole.log(document.body.getAttribute('style'));\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003estyle\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eborderLeftColor\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"green\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003estyle\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eborderLeftWidth\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"medium\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003estyle\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eborderLeftStyle\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"dotted\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetAttribute\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'style'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eproduces:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"border-left: medium dotted green;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003eborder-left: medium dotted green;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ein both Firefox and Chrome.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think that also suggests that we need to specify the concept of aliases.\u003c/p\u003e","bodyVersion":"a7280d45cba85c16e8634fa8dbc683368e85d638d70b2a7bfa93918954c8b18d","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271028230","createdAt":"2017-01-06T22:30:18Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXnbJAAqTI3MTAyODIzMA=="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":914684807,"createdAt":"2017-01-06T22:31:50Z","actor":{"__typename":"User","login":"dbaron","id":"MDQ6VXNlcjI0ODcyMQ==","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/248721?s=64\u0026v=4"},"label":{"id":"MDU6TGFiZWwzODE4OTE5OTA=","nameHTML":"css-text-3","name":"css-text-3","color":"c5def5","description":"Current Work"},"__isNode":"LabeledEvent","id":"MDEyOkxhYmVsZWRFdmVudDkxNDY4NDgwNw=="},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXo0_ABqTkxNDY4NDgwNw=="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":914684808,"createdAt":"2017-01-06T22:31:50Z","actor":{"__typename":"User","login":"dbaron","id":"MDQ6VXNlcjI0ODcyMQ==","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/248721?s=64\u0026v=4"},"label":{"id":"MDU6TGFiZWwzODE4OTI0MDk=","nameHTML":"cssom-1","name":"cssom-1","color":"c5def5","description":"Current Work"},"__isNode":"LabeledEvent","id":"MDEyOkxhYmVsZWRFdmVudDkxNDY4NDgwOA=="},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXo0_ABqTkxNDY4NDgwOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271030638,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"dholbert","avatarUrl":"https://avatars.githubusercontent.com/u/426803?v=4","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTAzMDYzOA==","body":"FWIW, the spec-text for `word-wrap` used to be as follows:\r\n\u003e For legacy reasons, UAs may also accept ‘word-wrap’ as an alternate name for the ‘overflow-wrap’ property. However this syntax non-conforming in author style sheets.\r\n\r\nhttps://www.w3.org/TR/2012/WD-css3-text-20120119/#overflow-wrap\r\n\r\nThe language was changed to its current form (\"as an alternate name...as if it were a shorthand\") in this commit in 2012: https://github.com/w3c/csswg-drafts/commit/05327146c505e17ec760efc6068c4864dba284ea","bodyHTML":"\u003cp dir=\"auto\"\u003eFWIW, the spec-text for \u003ccode class=\"notranslate\"\u003eword-wrap\u003c/code\u003e used to be as follows:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eFor legacy reasons, UAs may also accept ‘word-wrap’ as an alternate name for the ‘overflow-wrap’ property. However this syntax non-conforming in author style sheets.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.w3.org/TR/2012/WD-css3-text-20120119/#overflow-wrap\" rel=\"nofollow\"\u003ehttps://www.w3.org/TR/2012/WD-css3-text-20120119/#overflow-wrap\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe language was changed to its current form (\"as an alternate name...as if it were a shorthand\") in this commit in 2012: \u003ca class=\"commit-link\" data-hovercard-type=\"commit\" data-hovercard-url=\"https://github.com/w3c/csswg-drafts/commit/05327146c505e17ec760efc6068c4864dba284ea/hovercard\" href=\"https://github.com/w3c/csswg-drafts/commit/05327146c505e17ec760efc6068c4864dba284ea\"\u003e\u003ctt\u003e0532714\u003c/tt\u003e\u003c/a\u003e\u003c/p\u003e","bodyVersion":"1495d9457c087491807b465957868c0977a2badca42df1c21b6c2bd0678b6cfa","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271030638","createdAt":"2017-01-06T22:43:29Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXXzfmgAqTI3MTAzMDYzOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271036845,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"dholbert","avatarUrl":"https://avatars.githubusercontent.com/u/426803?v=4","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTAzNjg0NQ==","body":"(For the record, I filed https://bugs.chromium.org/p/chromium/issues/detail?id=679068 and https://bugs.webkit.org/show_bug.cgi?id=166782 on the odd Blink/WebKit behavior here. It doesn't seem like they're actually treating it as a shorthand -- they're doing some special alternate form of aliasing, distinct from their regular legacy-alias behavior.)","bodyHTML":"\u003cp dir=\"auto\"\u003e(For the record, I filed \u003ca href=\"https://bugs.chromium.org/p/chromium/issues/detail?id=679068\" rel=\"nofollow\"\u003ehttps://bugs.chromium.org/p/chromium/issues/detail?id=679068\u003c/a\u003e and \u003ca href=\"https://bugs.webkit.org/show_bug.cgi?id=166782\" rel=\"nofollow\"\u003ehttps://bugs.webkit.org/show_bug.cgi?id=166782\u003c/a\u003e on the odd Blink/WebKit behavior here. It doesn't seem like they're actually treating it as a shorthand -- they're doing some special alternate form of aliasing, distinct from their regular legacy-alias behavior.)\u003c/p\u003e","bodyVersion":"19499b56c76ea87c8256703ac8ef3b039f65bfa3261ae6c7ec775d905281721b","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271036845","createdAt":"2017-01-06T23:19:55Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2017-01-07T06:03:44Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/dholbert","login":"dholbert","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDE1OlVzZXJDb250ZW50RWRpdDE0MjA3Mjk1"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXYU2XgAqTI3MTAzNjg0NQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271053891,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"Manishearth","avatarUrl":"https://avatars.githubusercontent.com/u/1617736?u=3c160b4a66ca211ea091b90c00252f4561582680\u0026v=4","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTA1Mzg5MQ==","body":"cc @miketaylr since the compat spec references this concept of aliasing without defining it (and we should take input from them if we start building the exact definition)","bodyHTML":"\u003cp dir=\"auto\"\u003ecc \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/miketaylr/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/miketaylr\"\u003e@miketaylr\u003c/a\u003e since the compat spec references this concept of aliasing without defining it (and we should take input from them if we start building the exact definition)\u003c/p\u003e","bodyVersion":"dc871fa98ee3e3fdbc352150ce76241438a2dacd1b903c107bef0bbf7101c771","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271053891","createdAt":"2017-01-07T01:48:35Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXac9TgAqTI3MTA1Mzg5MQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":271056827,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"frivoal","avatarUrl":"https://avatars.githubusercontent.com/u/113268?u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e\u0026v=4","id":"MDQ6VXNlcjExMzI2OA=="},"id":"MDEyOklzc3VlQ29tbWVudDI3MTA1NjgyNw==","body":"The wording is unintentionally loose, but the intent was to make it a shorthand. If we want to keep that, we should update the phrasing to:\r\n\r\n\u003e For legacy reasons, UAs must treat word-wrap as an alternate name for the overflow-wrap property by implementing it as a shorthand of overflow-wrap.\r\n\r\nSome of the reasoning for that is documented here: https://wiki.csswg.org/ideas/aliasing\r\n\r\nTL;DR: we had a reasonably extensive discussion about how aliasing should work when \"aliasing\" break-before and page-break-before, and figured that shorthands were a good way to do that: well defined (including the OM) without needing to introduce any new concept, generally well behaved, deals well with the case when the legacy prop and the new prop don't have the exact same set of values.\r\n\r\nI still think the idea has merit to it, but if implementations generally agree on a different aliasing mechanism, we should spec it and use that. Spec-fiction doesn't help anyone. Maybe we can keep exceptions and use shorthands when the legacy prop and the new prop accept different values.","bodyHTML":"\u003cp dir=\"auto\"\u003eThe wording is unintentionally loose, but the intent was to make it a shorthand. If we want to keep that, we should update the phrasing to:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eFor legacy reasons, UAs must treat word-wrap as an alternate name for the overflow-wrap property by implementing it as a shorthand of overflow-wrap.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSome of the reasoning for that is documented here: \u003ca href=\"https://wiki.csswg.org/ideas/aliasing\" rel=\"nofollow\"\u003ehttps://wiki.csswg.org/ideas/aliasing\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTL;DR: we had a reasonably extensive discussion about how aliasing should work when \"aliasing\" break-before and page-break-before, and figured that shorthands were a good way to do that: well defined (including the OM) without needing to introduce any new concept, generally well behaved, deals well with the case when the legacy prop and the new prop don't have the exact same set of values.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI still think the idea has merit to it, but if implementations generally agree on a different aliasing mechanism, we should spec it and use that. Spec-fiction doesn't help anyone. Maybe we can keep exceptions and use shorthands when the legacy prop and the new prop accept different values.\u003c/p\u003e","bodyVersion":"10ffd882b7f9d1d05a83fa29f971169170db4395d1116e6f747c83a26019a37c","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-271056827","createdAt":"2017-01-07T02:32:52Z","authorAssociation":"COLLABORATOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABWXbFgCAAqTI3MTA1NjgyNw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":341909418,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"dholbert","avatarUrl":"https://avatars.githubusercontent.com/u/426803?v=4","id":"MDQ6VXNlcjQyNjgwMw=="},"id":"MDEyOklzc3VlQ29tbWVudDM0MTkwOTQxOA==","body":"\u003e I'd also note that the normal rules for shorthands would produce a third result that is...undesirable\r\n\u003e [serializing the modern property as its \"shorthand\" alias]\r\n\r\nThis doesn't actually seem to be what Chromium does for the few properties where they (ab)use shorthands to do aliasing.\r\n\r\nSample ([live jsfiddle version](https://jsfiddle.net/rfr5vgd1/)):\r\n````\r\ndocument.body.style.webkitColumnBreakInside = \"avoid\";\r\nconsole.log(document.body.getAttribute('style'));\r\n````\r\nThis testcase produces `break-inside: avoid;` even though they implement `-webkit-column-break-inside` as a shorthand for `break-inside`, as shown [here in their source](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/css/CSSProperties.json5?l=4467\u0026rcl=8dfdd5c89b113097bbc34690f042cec6b4675363) and as noted in https://bugs.chromium.org/p/chromium/issues/detail?id=679068#c11\r\n\r\nSo, they do the Right Thing here, even though it's the opposite of normal shorthand behavior. (I wonder if that's due to a special-case codepath for shorthands that are only shorthands of a single property, maybe?)","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eI'd also note that the normal rules for shorthands would produce a third result that is...undesirable\u003cbr\u003e\n[serializing the modern property as its \"shorthand\" alias]\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThis doesn't actually seem to be what Chromium does for the few properties where they (ab)use shorthands to do aliasing.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSample (\u003ca href=\"https://jsfiddle.net/rfr5vgd1/\" rel=\"nofollow\"\u003elive jsfiddle version\u003c/a\u003e):\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"document.body.style.webkitColumnBreakInside = \u0026quot;avoid\u0026quot;;\nconsole.log(document.body.getAttribute('style'));\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003edocument.body.style.webkitColumnBreakInside = \"avoid\";\nconsole.log(document.body.getAttribute('style'));\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis testcase produces \u003ccode class=\"notranslate\"\u003ebreak-inside: avoid;\u003c/code\u003e even though they implement \u003ccode class=\"notranslate\"\u003e-webkit-column-break-inside\u003c/code\u003e as a shorthand for \u003ccode class=\"notranslate\"\u003ebreak-inside\u003c/code\u003e, as shown \u003ca href=\"https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/css/CSSProperties.json5?l=4467\u0026amp;rcl=8dfdd5c89b113097bbc34690f042cec6b4675363\" rel=\"nofollow\"\u003ehere in their source\u003c/a\u003e and as noted in \u003ca href=\"https://bugs.chromium.org/p/chromium/issues/detail?id=679068#c11\" rel=\"nofollow\"\u003ehttps://bugs.chromium.org/p/chromium/issues/detail?id=679068#c11\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo, they do the Right Thing here, even though it's the opposite of normal shorthand behavior. (I wonder if that's due to a special-case codepath for shorthands that are only shorthands of a single property, maybe?)\u003c/p\u003e","bodyVersion":"36c27e45f79270db4c5132a32a3a4a40ab2425ab54b2e11cc296148c2d3ae260","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-341909418","createdAt":"2017-11-04T16:18:22Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABX4fTcLAAqTM0MTkwOTQxOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":351609288,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"Manishearth","id":"MDQ6VXNlcjE2MTc3MzY="},"id":"MDU6SXNzdWUxOTkzMDI1ODI=","number":866,"locked":false,"databaseId":199302582},"author":{"__typename":"User","login":"frivoal","avatarUrl":"https://avatars.githubusercontent.com/u/113268?u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e\u0026v=4","id":"MDQ6VXNlcjExMzI2OA=="},"id":"MDEyOklzc3VlQ29tbWVudDM1MTYwOTI4OA==","body":"@dholbert @dbaron Since you consider shorthands as a bad aliasing mechanism, could you define what you consider to be a good one?\r\n\r\n","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/dholbert/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/dholbert\"\u003e@dholbert\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/dbaron/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/dbaron\"\u003e@dbaron\u003c/a\u003e Since you consider shorthands as a bad aliasing mechanism, could you define what you consider to be a good one?\u003c/p\u003e","bodyVersion":"2844375aa253341cd644b17f0c4594571bd7275cf0352a9646a4608da52a977a","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/866#issuecomment-351609288","createdAt":"2017-12-14T04:59:51Z","authorAssociation":"COLLABORATOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABYFNknVgAqTM1MTYwOTI4OA=="},{"node":{"__typename":"AssignedEvent","__isIssueTimelineItems":"AssignedEvent","__isTimelineEvent":"AssignedEvent","databaseId":1387001463,"createdAt":"2017-12-14T04:59:56Z","actor":{"__typename":"User","login":"frivoal","id":"MDQ6VXNlcjExMzI2OA==","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/113268?s=64\u0026u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e\u0026v=4"},"assignee":{"__typename":"User","id":"MDQ6VXNlcjExMzI2OA==","__isNode":"User","login":"frivoal"},"__isNode":"AssignedEvent","id":"MDEzOkFzc2lnbmVkRXZlbnQxMzg3MDAxNDYz"},"cursor":"Y3Vyc29yOnYyOpPPAAABYFNksOABqjEzODcwMDE0NjM="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":1503546657,"createdAt":"2018-03-05T08:13:12Z","actor":{"__typename":"User","login":"frivoal","id":"MDQ6VXNlcjExMzI2OA==","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/113268?s=64\u0026u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e\u0026v=4"},"label":{"id":"MDU6TGFiZWw4NTYwNjY0MTg=","nameHTML":"Tracked 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IssueViewer-module__issueViewerContainer--flht4"><!--$--><div class="Box-sc-g0xbh4-0 ehzXEi"><div aria-label="Header" role="region" data-testid="issue-header"><div class="Box-sc-g0xbh4-0 fHrHav HeaderViewer-module__headerContainer--p0Eo1 "><div class="Box-sc-g0xbh4-0 krPEL" data-component="TitleArea" data-size-variant="medium"><h1 class="Box-sc-g0xbh4-0 clYxDg prc-Heading-Heading-6CmGO" data-component="PH_Title" data-hidden="false" style="--custom-font-size:26px,26px,var(--text-title-size-large, 32px),var(--text-title-size-large, 32px);--custom-line-height:1;--custom-font-weight:normal"><bdi class="Box-sc-g0xbh4-0 lhNOUb markdown-title" data-testid="issue-title">[css-text-3] Don't mince words about aliasing/shorthands with word-wrap</bdi> <span class="Box-sc-g0xbh4-0 YJa-Di">#866</span></h1></div><div class="Box-sc-g0xbh4-0 kuCWTy"><div class="Box-sc-g0xbh4-0 vcYPI"><div class="Box-sc-g0xbh4-0 cQpCwc"><div class="Box-sc-g0xbh4-0 lkyTpy"><a type="button" href="/login?return_to=" 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8a8 8 0 0 1 16 0Zm-1.5 0a6.5 6.5 0 1 0-13 0 6.5 6.5 0 0 0 13 0Z"></path></svg>Closed</span></div><!--$--><!--/$--><div class="Box-sc-g0xbh4-0 fMsVFP"><a class="Box-sc-g0xbh4-0 eqUmOV prc-Link-Link-85e08" href="https://github.com/w3c/csswg-drafts/pull/3110" data-hovercard-url="/w3c/csswg-drafts/pull/3110/hovercard" target="_blank" role="link"><svg focusable="false" aria-label="Merged" class="fgColor-done " role="img" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M5.45 5.154A4.25 4.25 0 0 0 9.25 7.5h1.378a2.251 2.251 0 1 1 0 1.5H9.25A5.734 5.734 0 0 1 5 7.123v3.505a2.25 2.25 0 1 1-1.5 0V5.372a2.25 2.25 0 1 1 1.95-.218ZM4.25 13.5a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm8.5-4.5a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5ZM5 3.25a.75.75 0 1 0 0 .005V3.25Z"></path></svg><span>#3110</span></a></div></div></div></div></div><div data-testid="issue-metadata-sticky" class="Box-sc-g0xbh4-0 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href="https://github.com/w3c/csswg-drafts/issues/866#issue-199302582" data-testid="issue-body-header-link"><relative-time sx="[object Object]" class="sc-aXZVg gcWyXp">on <!-- -->Jan 6, 2017</relative-time></a></div></div><div class="Box-sc-g0xbh4-0 kgTqOk ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 izrTon ActivityHeader-module__edits--LwHTE"></div><div class="Box-sc-g0xbh4-0 kpoUe"><div class="Box-sc-g0xbh4-0 ezcJRX"></div><div class="Box-sc-g0xbh4-0 dnyPuu"><button data-component="IconButton" type="button" aria-label="Issue body actions" aria-haspopup="true" aria-expanded="false" tabindex="0" class="Box-sc-g0xbh4-0 ffkqe prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":R15bd5db:-loading-announcement" id=":R15bd5db:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button></div></div></div></div></div><div class="IssueBodyViewer-module__IssueBody--MXyFt"><div data-testid="markdown-body" data-team-hovercards-enabled="true" class="markdown-body" data-turbolinks="false"><div class="Box-sc-g0xbh4-0 markdown-body NewMarkdownViewer-module__safe-html-box--cRsz0"><p dir="auto"><a href="https://drafts.csswg.org/css-text-3/#propdef-word-wrap" rel="nofollow">https://drafts.csswg.org/css-text-3/#propdef-word-wrap</a></p> <p dir="auto">The spec says:</p> <blockquote> <p dir="auto">For legacy reasons, UAs must treat word-wrap as an alternate name for the overflow-wrap property, as if it were a shorthand of overflow-wrap.</p> </blockquote> <p dir="auto">The "as if it were a shorthand" is a bit hand-wavy, especially since "as an alternate name" can mean something else.</p> <p dir="auto">In particular, we have two different ways of "aliasing" properties. One is by making them shorthands of the aliasee. The other is by making them redirect to the other property at parse time.</p> <p dir="auto">The difference crops up when doing things like serializing property declaration blocks. For example, the following CSS:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=" #foo { word-wrap: break-word; overflow-wrap: break-word; align-items: flex-end; -webkit-align-items: baseline; foobar: baz; }"><pre class="notranslate"> <span class="pl-kos">#</span><span class="pl-c1">foo</span> { <span class="pl-c1">word-wrap</span><span class="pl-kos">:</span> break-word; <span class="pl-c1">overflow-wrap</span><span class="pl-kos">:</span> break-word; <span class="pl-c1">align-items</span><span class="pl-kos">:</span> flex-end; <span class="pl-c1">-webkit-align-items</span><span class="pl-kos">:</span> baseline; <span class="pl-c1">foobar</span><span class="pl-kos">:</span> baz; }</pre></div> <p dir="auto">when serialized via <code class="notranslate">document.styleSheets[0].cssRules[0].cssText</code> in Firefox produces <code class="notranslate">"#foo { overflow-wrap: break-word; align-items: baseline; }"</code>, whereas in Chrome/Safari it produces <code class="notranslate">"#foo { word-wrap: break-word; overflow-wrap: break-word; align-items: baseline; }"</code>. This means that Firefox implements it as a "redirect alias", but Chrome/Safari implement it as a shorthand alias. All of them handle <code class="notranslate">-webkit-align-items</code> as a "redirect alias".</p> <p dir="auto">Browsers already use "redirect aliases" consistently for aliasing legacy prefixed properties. This concept of an alias is not defined in the spec, but is consistently implemented in browsers as something akin to:</p> <p dir="auto">If <code class="notranslate">foo</code> is an alias for property <code class="notranslate">bar</code>:</p> <ul dir="auto"> <li>At parse time, if you encounter a property of name <code class="notranslate">foo</code>, treat it as if it were the name you encountered was of property <code class="notranslate">bar</code></li> <li>In CSSStyleDeclaration add accessors for the alias <code class="notranslate">foo</code> that under the hood work with property <code class="notranslate">bar</code></li> <li>Nowhere else should there be traces of the name <code class="notranslate">foo</code> (including during serialization of a declaration block)</li> </ul> <p dir="auto">The <a href="https://compat.spec.whatwg.org/#css-simple-aliases" rel="nofollow">compat spec <em>uses</em> this concept of "aliasing"</a>, but does not define it.</p> <p dir="auto">We should either explicitly spec <code class="notranslate">word-wrap</code> to be a shorthand, or define this other concept of property alias in the spec and use it here (and also use it in the compat spec). I personally prefer the latter solution since aliasing is currently unspecced but imo shouldn't be, and because this is the only case where a shorthand is used for aliasing.</p> <p dir="auto">cc <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/dholbert/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/dholbert">@dholbert</a> <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/dbaron">@dbaron</a> <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/fantasai/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/fantasai">@fantasai</a></p></div></div><div class="IssueBodyViewer-module__IssueBodyTaskList--r4XEH"><!--$--><div 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