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.hero__breadcrumb img{display:none}.hero__div{position:absolute;bottom:0;left:0;width:100%;height:auto;margin-bottom:-1px}.code-block{background-color:#f4f7fe;padding:0 2rem;border-left:.5rem solid #306ffd;overflow:scroll;margin-bottom:2rem;margin-top:2rem;color:#000}.term{margin-bottom:1.5rem}.term:after{clear:both;content:"";display:table}.term__img{width:31.70732%;float:left;margin-right:2.43902%}.term__img:last-child{margin-right:0}.term__text{width:65.85366%;margin-right:2.43902%;padding-left:1rem;float:left;padding-top:1rem}.term__text:last-child{margin-right:0}.term__name{font-weight:700}.download-button{border:2px solid #fff;color:#fff;background-color:transparent;font-size:14px;font-weight:700;padding:0 .5rem;line-height:35px;-webkit-transition:background-color .2s ease;transition:background-color .2s ease}.download-button:hover{background-color:hsla(0,0%,100%,.2)}.download-button.float-left{float:left}.download-button.float-right{float:right}.download-white{font-size:16px;font-size:1rem;border:0 solid #fff;color:#306ffd;background-color:#fff;border-radius:50px;padding:1rem 1.5rem;-webkit-box-shadow:0 0 20px rgba(0,0,0,.2);box-shadow:0 0 20px rgba(0,0,0,.2);-webkit-transition:-webkit-box-shadow .2s ease;transition:-webkit-box-shadow .2s ease;transition:box-shadow .2s ease;transition:box-shadow .2s ease,-webkit-box-shadow .2s ease;font-weight:700}.download-white:active,.download-white:focus,.download-white:hover{background-color:#fff;-webkit-box-shadow:0 0 20px rgba(0,0,0,.7);box-shadow:0 0 20px rgba(0,0,0,.7)}.download-white.float-left{float:left}.download-white.float-right{float:right}.download-white img{margin-right:10px;max-width:none;height:14px}.download-button__icon{margin-right:.5rem}.tutorial-list{padding:4rem 0 8rem}.tutorial-list__title{border-bottom:0 solid transparent;padding-bottom:0;margin-bottom:6rem;text-align:center}.tutorial-item{margin-bottom:4rem}@media (min-width:59.375em){.tutorial-item{margin-bottom:0}}.tutorial-item__img{margin-bottom:1.5rem;-webkit-transition:opacity .3s ease;transition:opacity .3s ease}.tutorial-item__img:hover{opacity:.8}.tutorial-item__title{border-bottom:0 solid transparent;margin-bottom:1.5rem;padding-bottom:0}.tutorial-item__btn{background-color:transparent;border:2px solid #306ffd;border-radius:20px;padding:.5rem 1.5rem;font-weight:700;color:#306ffd;margin-top:1rem}.tutorial-item__btn img{margin-left:.5rem}.tutorial-item__btn:hover{color:#306ffd;background-color:#e1eaff}.not-found__dino{height:300px}@media (min-width:59.375em){.not-found__dino{width:48.78049%;float:left;margin-right:2.43902%}.not-found__dino:last-child{margin-right:0}}.not-found__dino img{height:300px;margin-left:auto;margin-right:auto;display:block}@media (min-width:59.375em){.not-found__dino img{float:right;margin:0}}.not-found__text{color:#000;text-align:center;margin-top:1.5rem}@media (min-width:59.375em){.not-found__text{width:48.78049%;float:left;margin-right:2.43902%;text-align:left;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column;height:300px;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;margin-top:0}.not-found__text:last-child{margin-right:0}}.img-caption__img{margin-bottom:0!important}.img-caption__text{width:100%;display:block;background-color:#ebebeb;margin-bottom:1.5rem;text-align:center;padding:.5rem;font-size:14px}.img-caption--dark .img-caption__text{background-color:#282828;color:#fff}.video-player{border-bottom:1px solid #eee;margin-bottom:2rem;cursor:pointer}.video-player__text{border-bottom:0 transparent;margin-bottom:0;display:inline-block;-webkit-transition:opacity .3s ease;transition:opacity .3s 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100px;grid-gap:1rem}.header-7{grid-row:1/2;grid-column:1/4}.sidebar-7{grid-row:2/4;grid-column:1/2}.content-1-7{grid-row:2/3;grid-column:2/4}.content-2-7{grid-row:3/4;grid-column:2/3}.content-3-7{grid-row:3/4;grid-column:3/4}.footer-7{grid-row:4/5;grid-column:1/4}.container-8{display:grid;width:100%;height:600px;grid-template-columns:200px 1fr 1fr;grid-template-rows:80px 1fr 1fr 100px;grid-gap:1rem;grid-template-areas:"header header header" "sidebar content-1 content-1" "sidebar content-2 content-3" "footer footer footer"}.header-8{grid-area:header}.sidebar-8{grid-area:sidebar}.content-1-8{grid-area:content-1}.content-2-8{grid-area:content-2}.content-3-8{grid-area:content-3}.footer-8{grid-area:footer}.container-9{display:grid;width:100%;height:600px;grid-gap:1rem;grid-template-columns:[main-start sidebar-start] 200px [sidebar-end content-start] 1fr [column3-start] 1fr [content-end main-end];grid-template-rows:[row1-start] 80px [row2-start] 1fr [row3-start] 1fr [row4-start] 100px [row4-end]}.header-9{grid-column:main-start/main-end;grid-row:row1-start/row2-start}.sidebar-9{grid-column:sidebar-start/sidebar-end;grid-row:row2-start/row4-start}.content-1-9{grid-column:content-start/content-end;grid-row:row2-start/row3-start}.content-2-9{grid-column:content-start/column3-start}.content-2-9,.content-3-9{grid-row:row3-start/row4-start}.content-3-9{grid-column:column3-start/content-end}.footer-9{grid-column:main-start/main-end;grid-row:row4-start/row4-end}.item{background-color:#1eaafc;background-image:linear-gradient(130deg,#6c52d9,#1eaafc 85%,#3edfd7);-webkit-box-shadow:0 10px 20px rgba(0,0,0,.19),0 6px 6px rgba(0,0,0,.23);box-shadow:0 10px 20px rgba(0,0,0,.19),0 6px 6px rgba(0,0,0,.23);color:#fff;border-radius:4px;border:6px solid #171717;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;font-size:18px;font-weight:700}.header-7,.header-8,.header-9{background-color:#1eaafc;background-image:linear-gradient(160deg,#6c52d9,#9b8ae6 127%)}.sidebar-7,.sidebar-8,.sidebar-9{background-image:linear-gradient(203deg,#3edfd7,#29a49d 90%)}.content-1-7,.content-1-8,.content-1-9,.content-2-7,.content-2-8,.content-2-9,.content-3-7,.content-3-8,.content-3-9{background-image:linear-gradient(130deg,#6c52d9,#1eaafc 85%,#3edfd7)}.footer-7,.footer-8,.footer-9{background-color:#6c52d9;background-image:linear-gradient(160deg,#6c52d9,#9b8ae6 127%)}.test{border:4px solid #000;background-color:rgba(0,0,0,.5);color:#fff;padding:1rem;text-align:center;margin-bottom:1rem}.gallery{float:left;margin-right:-100%}.gallery:nth-child(3n+1){width:31.70732%;clear:both;margin-left:0}.gallery:nth-child(3n+2){width:31.70732%;clear:none;margin-left:34.14634%}.gallery:nth-child(3n+3){width:31.70732%;clear:none;margin-left:68.29268%}@-webkit-keyframes modal-video{0%{opacity:0}to{opacity:1}}@keyframes modal-video{0%{opacity:0}to{opacity:1}}@-webkit-keyframes modal-video-inner{0%{-webkit-transform:translateY(100px);transform:translateY(100px)}to{-webkit-transform:translate(0);transform:translate(0)}}@keyframes modal-video-inner{0%{-webkit-transform:translateY(100px);transform:translateY(100px)}to{-webkit-transform:translate(0);transform:translate(0)}}.modal-video{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5);z-index:1000000;cursor:pointer;opacity:1;-webkit-animation-timing-function:ease-out;animation-timing-function:ease-out;-webkit-animation-duration:.3s;animation-duration:.3s;-webkit-animation-name:modal-video;animation-name:modal-video;-webkit-transition:opacity .3s ease-out;transition:opacity .3s ease-out}.modal-video-effect-leave{opacity:0}.modal-video-effect-leave .modal-video-movie-wrap{-webkit-transform:translateY(100px);transform:translateY(100px)}.modal-video-body{max-width:940px;width:100%;height:100%;margin:0 auto;display:table}.modal-video-inner{display:table-cell;vertical-align:middle;width:100%;height:100%}.modal-video-movie-wrap{width:100%;height:0;position:relative;padding-bottom:56.25%;background-color:#333;-webkit-animation-timing-function:ease-out;animation-timing-function:ease-out;-webkit-animation-duration:.3s;animation-duration:.3s;-webkit-animation-name:modal-video-inner;animation-name:modal-video-inner;-webkit-transform:translate(0);transform:translate(0);-webkit-transition:-webkit-transform .3s ease-out;transition:-webkit-transform .3s ease-out;transition:transform .3s ease-out;transition:transform .3s ease-out,-webkit-transform .3s ease-out}.modal-video-movie-wrap 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alt="download" data-reactid="9"/><!-- react-text: 10 -->Download Firefox<!-- /react-text --></button></a></div></header><div data-reactid="11"><div class="hero " data-reactid="12"><img class="mb6" style="width:80px;" 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" alt="logo" data-reactid="13"/><h1 data-reactid="14">Firefox DevTools Playground</h1><div class="container" data-reactid="15"><div class="col-md-6 col-md-offset-3 mt3" data-reactid="16"><p class="mb6" data-reactid="17">Learn, build, improve, and create with Firefox DevTools.</p><a href="https://www.mozilla.org/firefox/developer/?utm_source=moz-playground&amp;utm_medium=referral&amp;utm_content=index-hero" target="_blank" rel="noopener noreferrer" data-reactid="18"><button class="download-white" data-reactid="19"><img 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