CINXE.COM
2021 March
<!DOCTYPE html> <html dir="ltr" lang="en-US"> <head><meta charset="UTF-8" /><script>if(navigator.userAgent.match(/MSIE|Internet Explorer/i)||navigator.userAgent.match(/Trident\/7\..*?rv:11/i)){var href=document.location.href;if(!href.match(/[?&]nowprocket/)){if(href.indexOf("?")==-1){if(href.indexOf("#")==-1){document.location.href=href+"?nowprocket=1"}else{document.location.href=href.replace("#","?nowprocket=1#")}}else{if(href.indexOf("#")==-1){document.location.href=href+"&nowprocket=1"}else{document.location.href=href.replace("#","&nowprocket=1#")}}}}</script><script>(()=>{class RocketLazyLoadScripts{constructor(){this.v="1.2.6",this.triggerEvents=["keydown","mousedown","mousemove","touchmove","touchstart","touchend","wheel"],this.userEventHandler=this.t.bind(this),this.touchStartHandler=this.i.bind(this),this.touchMoveHandler=this.o.bind(this),this.touchEndHandler=this.h.bind(this),this.clickHandler=this.u.bind(this),this.interceptedClicks=[],this.interceptedClickListeners=[],this.l(this),window.addEventListener("pageshow",(t=>{this.persisted=t.persisted,this.everythingLoaded&&this.m()})),this.CSPIssue=sessionStorage.getItem("rocketCSPIssue"),document.addEventListener("securitypolicyviolation",(t=>{this.CSPIssue||"script-src-elem"!==t.violatedDirective||"data"!==t.blockedURI||(this.CSPIssue=!0,sessionStorage.setItem("rocketCSPIssue",!0))})),document.addEventListener("DOMContentLoaded",(()=>{this.k()})),this.delayedScripts={normal:[],async:[],defer:[]},this.trash=[],this.allJQueries=[]}p(t){document.hidden?t.t():(this.triggerEvents.forEach((e=>window.addEventListener(e,t.userEventHandler,{passive:!0}))),window.addEventListener("touchstart",t.touchStartHandler,{passive:!0}),window.addEventListener("mousedown",t.touchStartHandler),document.addEventListener("visibilitychange",t.userEventHandler))}_(){this.triggerEvents.forEach((t=>window.removeEventListener(t,this.userEventHandler,{passive:!0}))),document.removeEventListener("visibilitychange",this.userEventHandler)}i(t){"HTML"!==t.target.tagName&&(window.addEventListener("touchend",this.touchEndHandler),window.addEventListener("mouseup",this.touchEndHandler),window.addEventListener("touchmove",this.touchMoveHandler,{passive:!0}),window.addEventListener("mousemove",this.touchMoveHandler),t.target.addEventListener("click",this.clickHandler),this.L(t.target,!0),this.S(t.target,"onclick","rocket-onclick"),this.C())}o(t){window.removeEventListener("touchend",this.touchEndHandler),window.removeEventListener("mouseup",this.touchEndHandler),window.removeEventListener("touchmove",this.touchMoveHandler,{passive:!0}),window.removeEventListener("mousemove",this.touchMoveHandler),t.target.removeEventListener("click",this.clickHandler),this.L(t.target,!1),this.S(t.target,"rocket-onclick","onclick"),this.M()}h(){window.removeEventListener("touchend",this.touchEndHandler),window.removeEventListener("mouseup",this.touchEndHandler),window.removeEventListener("touchmove",this.touchMoveHandler,{passive:!0}),window.removeEventListener("mousemove",this.touchMoveHandler)}u(t){t.target.removeEventListener("click",this.clickHandler),this.L(t.target,!1),this.S(t.target,"rocket-onclick","onclick"),this.interceptedClicks.push(t),t.preventDefault(),t.stopPropagation(),t.stopImmediatePropagation(),this.M()}O(){window.removeEventListener("touchstart",this.touchStartHandler,{passive:!0}),window.removeEventListener("mousedown",this.touchStartHandler),this.interceptedClicks.forEach((t=>{t.target.dispatchEvent(new MouseEvent("click",{view:t.view,bubbles:!0,cancelable:!0}))}))}l(t){EventTarget.prototype.addEventListenerWPRocketBase=EventTarget.prototype.addEventListener,EventTarget.prototype.addEventListener=function(e,i,o){"click"!==e||t.windowLoaded||i===t.clickHandler||t.interceptedClickListeners.push({target:this,func:i,options:o}),(this||window).addEventListenerWPRocketBase(e,i,o)}}L(t,e){this.interceptedClickListeners.forEach((i=>{i.target===t&&(e?t.removeEventListener("click",i.func,i.options):t.addEventListener("click",i.func,i.options))})),t.parentNode!==document.documentElement&&this.L(t.parentNode,e)}D(){return new Promise((t=>{this.P?this.M=t:t()}))}C(){this.P=!0}M(){this.P=!1}S(t,e,i){t.hasAttribute&&t.hasAttribute(e)&&(event.target.setAttribute(i,event.target.getAttribute(e)),event.target.removeAttribute(e))}t(){this._(this),"loading"===document.readyState?document.addEventListener("DOMContentLoaded",this.R.bind(this)):this.R()}k(){let t=[];document.querySelectorAll("script[type=rocketlazyloadscript][data-rocket-src]").forEach((e=>{let i=e.getAttribute("data-rocket-src");if(i&&!i.startsWith("data:")){0===i.indexOf("//")&&(i=location.protocol+i);try{const o=new URL(i).origin;o!==location.origin&&t.push({src:o,crossOrigin:e.crossOrigin||"module"===e.getAttribute("data-rocket-type")})}catch(t){}}})),t=[...new Map(t.map((t=>[JSON.stringify(t),t]))).values()],this.T(t,"preconnect")}async R(){this.lastBreath=Date.now(),this.j(this),this.F(this),this.I(),this.W(),this.q(),await this.A(this.delayedScripts.normal),await this.A(this.delayedScripts.defer),await this.A(this.delayedScripts.async);try{await this.U(),await this.H(this),await this.J()}catch(t){console.error(t)}window.dispatchEvent(new Event("rocket-allScriptsLoaded")),this.everythingLoaded=!0,this.D().then((()=>{this.O()})),this.N()}W(){document.querySelectorAll("script[type=rocketlazyloadscript]").forEach((t=>{t.hasAttribute("data-rocket-src")?t.hasAttribute("async")&&!1!==t.async?this.delayedScripts.async.push(t):t.hasAttribute("defer")&&!1!==t.defer||"module"===t.getAttribute("data-rocket-type")?this.delayedScripts.defer.push(t):this.delayedScripts.normal.push(t):this.delayedScripts.normal.push(t)}))}async B(t){if(await this.G(),!0!==t.noModule||!("noModule"in HTMLScriptElement.prototype))return new Promise((e=>{let i;function o(){(i||t).setAttribute("data-rocket-status","executed"),e()}try{if(navigator.userAgent.indexOf("Firefox/")>0||""===navigator.vendor||this.CSPIssue)i=document.createElement("script"),[...t.attributes].forEach((t=>{let e=t.nodeName;"type"!==e&&("data-rocket-type"===e&&(e="type"),"data-rocket-src"===e&&(e="src"),i.setAttribute(e,t.nodeValue))})),t.text&&(i.text=t.text),i.hasAttribute("src")?(i.addEventListener("load",o),i.addEventListener("error",(function(){i.setAttribute("data-rocket-status","failed-network"),e()})),setTimeout((()=>{i.isConnected||e()}),1)):(i.text=t.text,o()),t.parentNode.replaceChild(i,t);else{const i=t.getAttribute("data-rocket-type"),s=t.getAttribute("data-rocket-src");i?(t.type=i,t.removeAttribute("data-rocket-type")):t.removeAttribute("type"),t.addEventListener("load",o),t.addEventListener("error",(i=>{this.CSPIssue&&i.target.src.startsWith("data:")?(console.log("WPRocket: data-uri blocked by CSP -> fallback"),t.removeAttribute("src"),this.B(t).then(e)):(t.setAttribute("data-rocket-status","failed-network"),e())})),s?(t.removeAttribute("data-rocket-src"),t.src=s):t.src="data:text/javascript;base64,"+window.btoa(unescape(encodeURIComponent(t.text)))}}catch(i){t.setAttribute("data-rocket-status","failed-transform"),e()}}));t.setAttribute("data-rocket-status","skipped")}async A(t){const e=t.shift();return e&&e.isConnected?(await this.B(e),this.A(t)):Promise.resolve()}q(){this.T([...this.delayedScripts.normal,...this.delayedScripts.defer,...this.delayedScripts.async],"preload")}T(t,e){var i=document.createDocumentFragment();t.forEach((t=>{const o=t.getAttribute&&t.getAttribute("data-rocket-src")||t.src;if(o&&!o.startsWith("data:")){const s=document.createElement("link");s.href=o,s.rel=e,"preconnect"!==e&&(s.as="script"),t.getAttribute&&"module"===t.getAttribute("data-rocket-type")&&(s.crossOrigin=!0),t.crossOrigin&&(s.crossOrigin=t.crossOrigin),t.integrity&&(s.integrity=t.integrity),i.appendChild(s),this.trash.push(s)}})),document.head.appendChild(i)}j(t){let e={};function i(i,o){return e[o].eventsToRewrite.indexOf(i)>=0&&!t.everythingLoaded?"rocket-"+i:i}function o(t,o){!function(t){e[t]||(e[t]={originalFunctions:{add:t.addEventListener,remove:t.removeEventListener},eventsToRewrite:[]},t.addEventListener=function(){arguments[0]=i(arguments[0],t),e[t].originalFunctions.add.apply(t,arguments)},t.removeEventListener=function(){arguments[0]=i(arguments[0],t),e[t].originalFunctions.remove.apply(t,arguments)})}(t),e[t].eventsToRewrite.push(o)}function s(e,i){let o=e[i];e[i]=null,Object.defineProperty(e,i,{get:()=>o||function(){},set(s){t.everythingLoaded?o=s:e["rocket"+i]=o=s}})}o(document,"DOMContentLoaded"),o(window,"DOMContentLoaded"),o(window,"load"),o(window,"pageshow"),o(document,"readystatechange"),s(document,"onreadystatechange"),s(window,"onload"),s(window,"onpageshow");try{Object.defineProperty(document,"readyState",{get:()=>t.rocketReadyState,set(e){t.rocketReadyState=e},configurable:!0}),document.readyState="loading"}catch(t){console.log("WPRocket DJE readyState conflict, bypassing")}}F(t){let e;function i(e){return t.everythingLoaded?e:e.split(" ").map((t=>"load"===t||0===t.indexOf("load.")?"rocket-jquery-load":t)).join(" ")}function o(o){function s(t){const e=o.fn[t];o.fn[t]=o.fn.init.prototype[t]=function(){return this[0]===window&&("string"==typeof arguments[0]||arguments[0]instanceof String?arguments[0]=i(arguments[0]):"object"==typeof arguments[0]&&Object.keys(arguments[0]).forEach((t=>{const e=arguments[0][t];delete arguments[0][t],arguments[0][i(t)]=e}))),e.apply(this,arguments),this}}o&&o.fn&&!t.allJQueries.includes(o)&&(o.fn.ready=o.fn.init.prototype.ready=function(e){return t.domReadyFired?e.bind(document)(o):document.addEventListener("rocket-DOMContentLoaded",(()=>e.bind(document)(o))),o([])},s("on"),s("one"),t.allJQueries.push(o)),e=o}o(window.jQuery),Object.defineProperty(window,"jQuery",{get:()=>e,set(t){o(t)}})}async H(t){const e=document.querySelector("script[data-webpack]");e&&(await async function(){return new Promise((t=>{e.addEventListener("load",t),e.addEventListener("error",t)}))}(),await t.K(),await t.H(t))}async U(){this.domReadyFired=!0;try{document.readyState="interactive"}catch(t){}await this.G(),document.dispatchEvent(new Event("rocket-readystatechange")),await this.G(),document.rocketonreadystatechange&&document.rocketonreadystatechange(),await this.G(),document.dispatchEvent(new Event("rocket-DOMContentLoaded")),await this.G(),window.dispatchEvent(new Event("rocket-DOMContentLoaded"))}async J(){try{document.readyState="complete"}catch(t){}await this.G(),document.dispatchEvent(new Event("rocket-readystatechange")),await this.G(),document.rocketonreadystatechange&&document.rocketonreadystatechange(),await this.G(),window.dispatchEvent(new Event("rocket-load")),await this.G(),window.rocketonload&&window.rocketonload(),await this.G(),this.allJQueries.forEach((t=>t(window).trigger("rocket-jquery-load"))),await this.G();const t=new Event("rocket-pageshow");t.persisted=this.persisted,window.dispatchEvent(t),await this.G(),window.rocketonpageshow&&window.rocketonpageshow({persisted:this.persisted}),this.windowLoaded=!0}m(){document.onreadystatechange&&document.onreadystatechange(),window.onload&&window.onload(),window.onpageshow&&window.onpageshow({persisted:this.persisted})}I(){const t=new Map;document.write=document.writeln=function(e){const i=document.currentScript;i||console.error("WPRocket unable to document.write this: "+e);const o=document.createRange(),s=i.parentElement;let n=t.get(i);void 0===n&&(n=i.nextSibling,t.set(i,n));const c=document.createDocumentFragment();o.setStart(c,0),c.appendChild(o.createContextualFragment(e)),s.insertBefore(c,n)}}async G(){Date.now()-this.lastBreath>45&&(await this.K(),this.lastBreath=Date.now())}async K(){return document.hidden?new Promise((t=>setTimeout(t))):new Promise((t=>requestAnimationFrame(t)))}N(){this.trash.forEach((t=>t.remove()))}static run(){const t=new RocketLazyLoadScripts;t.p(t)}}RocketLazyLoadScripts.run()})();</script> <!-- Global Site Tag (gtag.js) - Google Analytics --> <script type="rocketlazyloadscript" data-rocket-src="https://www.googletagmanager.com/gtag/js?id=UA-4975786-4" async></script> <script type="rocketlazyloadscript"> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-4975786-4'); </script> <meta name="viewport" content="width=device-width, initial-scale=1" /> <link href="https://primaltrek.com/blog/wp-content/thesis/skins/classic-r/css.css" rel="stylesheet" /> <title>2021 March</title> <meta name="robots" content="noindex, noodp, noydir" /> <link href="https://primaltrek.com/blog/feed/" rel="alternate" type="application/rss+xml" title="Primal Trek feed" /> <link href="https://primaltrek.com/blog/xmlrpc.php" rel="pingback" /> <meta name='robots' content='max-image-preview:large' /> <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style> <style id='wp-emoji-styles-inline-css' type='text/css'> img.wp-smiley, img.emoji { display: inline !important; border: none !important; box-shadow: none !important; height: 1em !important; width: 1em !important; margin: 0 0.07em !important; vertical-align: -0.1em !important; background: none !important; padding: 0 !important; } </style> <link rel='stylesheet' id='wp-block-library-css' href='https://primaltrek.com/blog/wp-includes/css/dist/block-library/style.min.css?ver=6.7.1' type='text/css' media='all' /> <style id='classic-theme-styles-inline-css' type='text/css'> /*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} </style> <style id='global-styles-inline-css' type='text/css'> :root{--wp--preset--aspect-ratio--square: 1;--wp--preset--aspect-ratio--4-3: 4/3;--wp--preset--aspect-ratio--3-4: 3/4;--wp--preset--aspect-ratio--3-2: 3/2;--wp--preset--aspect-ratio--2-3: 2/3;--wp--preset--aspect-ratio--16-9: 16/9;--wp--preset--aspect-ratio--9-16: 9/16;--wp--preset--color--black: #000000;--wp--preset--color--cyan-bluish-gray: #abb8c3;--wp--preset--color--white: #ffffff;--wp--preset--color--pale-pink: #f78da7;--wp--preset--color--vivid-red: #cf2e2e;--wp--preset--color--luminous-vivid-orange: #ff6900;--wp--preset--color--luminous-vivid-amber: #fcb900;--wp--preset--color--light-green-cyan: #7bdcb5;--wp--preset--color--vivid-green-cyan: #00d084;--wp--preset--color--pale-cyan-blue: #8ed1fc;--wp--preset--color--vivid-cyan-blue: #0693e3;--wp--preset--color--vivid-purple: #9b51e0;--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple: linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%);--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan: linear-gradient(135deg,rgb(122,220,180) 0%,rgb(0,208,130) 100%);--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange: linear-gradient(135deg,rgba(252,185,0,1) 0%,rgba(255,105,0,1) 100%);--wp--preset--gradient--luminous-vivid-orange-to-vivid-red: linear-gradient(135deg,rgba(255,105,0,1) 0%,rgb(207,46,46) 100%);--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray: linear-gradient(135deg,rgb(238,238,238) 0%,rgb(169,184,195) 100%);--wp--preset--gradient--cool-to-warm-spectrum: linear-gradient(135deg,rgb(74,234,220) 0%,rgb(151,120,209) 20%,rgb(207,42,186) 40%,rgb(238,44,130) 60%,rgb(251,105,98) 80%,rgb(254,248,76) 100%);--wp--preset--gradient--blush-light-purple: linear-gradient(135deg,rgb(255,206,236) 0%,rgb(152,150,240) 100%);--wp--preset--gradient--blush-bordeaux: linear-gradient(135deg,rgb(254,205,165) 0%,rgb(254,45,45) 50%,rgb(107,0,62) 100%);--wp--preset--gradient--luminous-dusk: linear-gradient(135deg,rgb(255,203,112) 0%,rgb(199,81,192) 50%,rgb(65,88,208) 100%);--wp--preset--gradient--pale-ocean: linear-gradient(135deg,rgb(255,245,203) 0%,rgb(182,227,212) 50%,rgb(51,167,181) 100%);--wp--preset--gradient--electric-grass: linear-gradient(135deg,rgb(202,248,128) 0%,rgb(113,206,126) 100%);--wp--preset--gradient--midnight: linear-gradient(135deg,rgb(2,3,129) 0%,rgb(40,116,252) 100%);--wp--preset--font-size--small: 13px;--wp--preset--font-size--medium: 20px;--wp--preset--font-size--large: 36px;--wp--preset--font-size--x-large: 42px;--wp--preset--spacing--20: 0.44rem;--wp--preset--spacing--30: 0.67rem;--wp--preset--spacing--40: 1rem;--wp--preset--spacing--50: 1.5rem;--wp--preset--spacing--60: 2.25rem;--wp--preset--spacing--70: 3.38rem;--wp--preset--spacing--80: 5.06rem;--wp--preset--shadow--natural: 6px 6px 9px rgba(0, 0, 0, 0.2);--wp--preset--shadow--deep: 12px 12px 50px rgba(0, 0, 0, 0.4);--wp--preset--shadow--sharp: 6px 6px 0px rgba(0, 0, 0, 0.2);--wp--preset--shadow--outlined: 6px 6px 0px -3px rgba(255, 255, 255, 1), 6px 6px rgba(0, 0, 0, 1);--wp--preset--shadow--crisp: 6px 6px 0px rgba(0, 0, 0, 1);}:where(.is-layout-flex){gap: 0.5em;}:where(.is-layout-grid){gap: 0.5em;}body .is-layout-flex{display: flex;}.is-layout-flex{flex-wrap: wrap;align-items: center;}.is-layout-flex > :is(*, div){margin: 0;}body .is-layout-grid{display: grid;}.is-layout-grid > :is(*, div){margin: 0;}:where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;}:where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-color{color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-color{color: var(--wp--preset--color--white) !important;}.has-pale-pink-color{color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-color{color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-color{color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-color{color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-color{color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-color{color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-color{color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-color{color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-color{color: var(--wp--preset--color--vivid-purple) !important;}.has-black-background-color{background-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-background-color{background-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-background-color{background-color: var(--wp--preset--color--white) !important;}.has-pale-pink-background-color{background-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-background-color{background-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-background-color{background-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-background-color{background-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-background-color{background-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-background-color{background-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-background-color{background-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-background-color{background-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-background-color{background-color: var(--wp--preset--color--vivid-purple) !important;}.has-black-border-color{border-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-border-color{border-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-border-color{border-color: var(--wp--preset--color--white) !important;}.has-pale-pink-border-color{border-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-border-color{border-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-border-color{border-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-border-color{border-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-border-color{border-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-border-color{border-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-border-color{border-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-border-color{border-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-border-color{border-color: var(--wp--preset--color--vivid-purple) !important;}.has-vivid-cyan-blue-to-vivid-purple-gradient-background{background: var(--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple) !important;}.has-light-green-cyan-to-vivid-green-cyan-gradient-background{background: var(--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan) !important;}.has-luminous-vivid-amber-to-luminous-vivid-orange-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange) !important;}.has-luminous-vivid-orange-to-vivid-red-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-orange-to-vivid-red) !important;}.has-very-light-gray-to-cyan-bluish-gray-gradient-background{background: var(--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray) !important;}.has-cool-to-warm-spectrum-gradient-background{background: var(--wp--preset--gradient--cool-to-warm-spectrum) !important;}.has-blush-light-purple-gradient-background{background: var(--wp--preset--gradient--blush-light-purple) !important;}.has-blush-bordeaux-gradient-background{background: var(--wp--preset--gradient--blush-bordeaux) !important;}.has-luminous-dusk-gradient-background{background: var(--wp--preset--gradient--luminous-dusk) !important;}.has-pale-ocean-gradient-background{background: var(--wp--preset--gradient--pale-ocean) !important;}.has-electric-grass-gradient-background{background: var(--wp--preset--gradient--electric-grass) !important;}.has-midnight-gradient-background{background: var(--wp--preset--gradient--midnight) !important;}.has-small-font-size{font-size: var(--wp--preset--font-size--small) !important;}.has-medium-font-size{font-size: var(--wp--preset--font-size--medium) !important;}.has-large-font-size{font-size: var(--wp--preset--font-size--large) !important;}.has-x-large-font-size{font-size: var(--wp--preset--font-size--x-large) !important;} :where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;} :where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;} :root :where(.wp-block-pullquote){font-size: 1.5em;line-height: 1.6;} </style> <link rel="https://api.w.org/" href="https://primaltrek.com/blog/wp-json/" /><noscript><style id="rocket-lazyload-nojs-css">.rll-youtube-player, [data-lazy-src]{display:none !important;}</style></noscript><link href="https://primaltrek.com/blog/wp-content/uploads/2013/11/favicon.ico" rel="shortcut icon" /> <noscript><style>.menu { display: block; }</style></noscript></head> <body class="template-month"> <div data-rocket-location-hash="93b9c55a76db46220508acbe442d05f2" class="container"> <span class="menu_control">≡ Menu</span> <ul id="menu-home" class="menu"><li id="menu-item-6343" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-6343"><a href="https://primaltrek.com">Home</a></li> <li id="menu-item-6344" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6344"><a href="https://primaltrek.com/blog/about-me/">ABOUT ME</a></li> </ul> <div data-rocket-location-hash="b9268b4432fe0746a994bae6f90d5f50" id="header" class="header"> <div data-rocket-location-hash="696b1c560abf5a44324f237b6a87c67d" id="site_title">Primal Trek</div> <div data-rocket-location-hash="286d2406dbbc084b5f3bca3c546609b6" id="site_tagline">a journey through Chinese culture</div> </div> <div data-rocket-location-hash="4d1b0565a2cfe76418efcf78086d3f61" class="columns"> <div data-rocket-location-hash="5ae7e3edf258b48cd17dc707fb7fef9c" class="content"> <div class="archive_intro post_box grt top"> <h1 class="archive_title headline">March 2021</h1> </div> <div id="post-8987" class="post_box grt top" itemscope itemtype="https://schema.org/Article"> <div class="headline_area"> <h2 class="headline" itemprop="headline"><a href="https://primaltrek.com/blog/2021/03/19/coins-made-of-turtle-shell-discovered-at-famen-temple/" rel="bookmark">Coins Made of Turtle Shell Discovered at Famen Temple</a></h2> <div class="byline small"> <span class="post_author_intro">by</span> <span class="post_author" itemprop="author">Gary Ashkenazy</span> <meta itemprop="datePublished" content="2021-03-19" /> <meta itemprop="dateModified" content="2021-03-19" /> <span class="post_date_intro">on</span> <span class="post_date" title="2021-03-19">March 19, 2021</span> </div> </div> <a class="thumb_link" href="https://primaltrek.com/blog/2021/03/19/coins-made-of-turtle-shell-discovered-at-famen-temple/" title="read more"><img class="thumb alignleft frame" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20162%20150'%3E%3C/svg%3E" width="162" height="150" alt="“Kaiyuan Tongbao” coin made from hawksbill sea turtle shell" itemprop="thumbnailUrl" data-lazy-src="https://primaltrek.com/blog/wp-content/uploads/2021/03/famenturtleshellcoin2.jpg" /><noscript><img class="thumb alignleft frame" src="https://primaltrek.com/blog/wp-content/uploads/2021/03/famenturtleshellcoin2.jpg" width="162" height="150" alt="“Kaiyuan Tongbao” coin made from hawksbill sea turtle shell" itemprop="thumbnailUrl" /></noscript></a> <div class="post_content post_excerpt" itemprop="description"> <p>During renovation of the Famen Temple (Famensi 法门寺) in 1987, an underground “palace” was discovered under the foundation of the pagoda. This secret vault was found intact and had never been looted by grave robbers. Upon opening the vault, the archaeologists discovered remarkable treasures including the relic of a finger bone of the Buddha (释迦牟尼). [...]</p> </div> <meta itemprop="interactionCount" content="UserComments:0" /> <span class="bracket">{</span> <a class="num_comments_link" href="https://primaltrek.com/blog/2021/03/19/coins-made-of-turtle-shell-discovered-at-famen-temple/#commentform" rel="nofollow"><span class="num_comments">0</span> comments</a> <span class="bracket">}</span> </div> <div id="post-9214" class="post_box grt" itemscope itemtype="https://schema.org/Article"> <div class="headline_area"> <h2 class="headline" itemprop="headline"><a href="https://primaltrek.com/blog/2021/03/08/archaeological-blind-boxes-and-ancient-chinese-coins/" rel="bookmark">Archaeological Blind Boxes and Ancient Chinese Coins</a></h2> <div class="byline small"> <span class="post_author_intro">by</span> <span class="post_author" itemprop="author">Gary Ashkenazy</span> <meta itemprop="datePublished" content="2021-03-08" /> <meta itemprop="dateModified" content="2021-03-08" /> <span class="post_date_intro">on</span> <span class="post_date" title="2021-03-08">March 8, 2021</span> </div> </div> <a class="thumb_link" href="https://primaltrek.com/blog/2021/03/08/archaeological-blind-boxes-and-ancient-chinese-coins/" title="read more"><img class="thumb alignleft frame" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20139'%3E%3C/svg%3E" width="150" height="139" alt="Archaeological Blind Boxes and Ancient Chinese Coins thumbnail" itemprop="thumbnailUrl" data-lazy-src="https://primaltrek.com/blog/wp-content/uploads/2021/03/digtreasurebox2.jpg" /><noscript><img class="thumb alignleft frame" src="https://primaltrek.com/blog/wp-content/uploads/2021/03/digtreasurebox2.jpg" width="150" height="139" alt="Archaeological Blind Boxes and Ancient Chinese Coins thumbnail" itemprop="thumbnailUrl" /></noscript></a> <div class="post_content post_excerpt" itemprop="description"> <p>Staff member at the Henan Museum using a ‘Luoyang shovel’ to dig for treasure in a blind box For several years, Chinese museums have been offering archaeological blind boxes (考古盲盒) in an effort to promote and popularize archaeology to the general public. These boxes are sold in museum gift shops and are especially popular with [...]</p> </div> <meta itemprop="interactionCount" content="UserComments:0" /> <span class="bracket">{</span> <a class="num_comments_link" href="https://primaltrek.com/blog/2021/03/08/archaeological-blind-boxes-and-ancient-chinese-coins/#commentform" rel="nofollow"><span class="num_comments">0</span> comments</a> <span class="bracket">}</span> </div> <div id="post-8224" class="post_box grt" itemscope itemtype="https://schema.org/Article"> <div class="headline_area"> <h2 class="headline" itemprop="headline"><a href="https://primaltrek.com/blog/2021/03/01/bodhidharma-holding-a-wu-zhu-coin/" rel="bookmark">Bodhidharma Holding a Wu Zhu Coin</a></h2> <div class="byline small"> <span class="post_author_intro">by</span> <span class="post_author" itemprop="author">Gary Ashkenazy</span> <meta itemprop="datePublished" content="2021-03-01" /> <meta itemprop="dateModified" content="2021-03-01" /> <span class="post_date_intro">on</span> <span class="post_date" title="2021-03-01">March 1, 2021</span> </div> </div> <a class="thumb_link" href="https://primaltrek.com/blog/2021/03/01/bodhidharma-holding-a-wu-zhu-coin/" title="read more"><img class="thumb alignleft frame" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20224'%3E%3C/svg%3E" width="150" height="224" alt="Bodhidharma Holding a Wu Zhu Coin thumbnail" itemprop="thumbnailUrl" data-lazy-src="https://primaltrek.com/blog/wp-content/uploads/2021/03/bodhidharma4.jpg" /><noscript><img class="thumb alignleft frame" src="https://primaltrek.com/blog/wp-content/uploads/2021/03/bodhidharma4.jpg" width="150" height="224" alt="Bodhidharma Holding a Wu Zhu Coin thumbnail" itemprop="thumbnailUrl" /></noscript></a> <div class="post_content post_excerpt" itemprop="description"> <p>Bodhidharma (菩提达摩) was a Buddhist monk who came to China from Central Asia or the Indian subcontinent during the 5th or 6th centuries. Little is known about him but he is regarded as the founder of Chan Buddhism (禅) in China. Chan Buddhism eventually migrated to Japan where it further evolved into what is known [...]</p> </div> <meta itemprop="interactionCount" content="UserComments:0" /> <span class="bracket">{</span> <a class="num_comments_link" href="https://primaltrek.com/blog/2021/03/01/bodhidharma-holding-a-wu-zhu-coin/#commentform" rel="nofollow"><span class="num_comments">0</span> comments</a> <span class="bracket">}</span> </div> </div> <div data-rocket-location-hash="d5bf9b362f33a4a86573fa136917f78d" class="sidebar"> <div class="widget widget_categories" id="categories-3"><p class="widget_title">Categories</p> <ul> <li class="cat-item cat-item-3"><a href="https://primaltrek.com/blog/category/chinese-charms/">Chinese charms</a> (45) </li> <li class="cat-item cat-item-12"><a href="https://primaltrek.com/blog/category/chinese-chess-xiangqi/">Chinese chess (xiangqi)</a> (3) </li> <li class="cat-item cat-item-4"><a href="https://primaltrek.com/blog/category/chinese-coins/">Chinese coins</a> (90) </li> <li class="cat-item cat-item-11"><a href="https://primaltrek.com/blog/category/chinese-mirrors/">Chinese mirrors</a> (3) </li> <li class="cat-item cat-item-8"><a href="https://primaltrek.com/blog/category/chinese-paper-money/">Chinese paper money</a> (3) </li> <li class="cat-item cat-item-16"><a href="https://primaltrek.com/blog/category/horse-coins/">Horse coins</a> (3) </li> <li class="cat-item cat-item-10"><a href="https://primaltrek.com/blog/category/japanese-charms/">Japanese charms</a> (3) </li> <li class="cat-item cat-item-17"><a href="https://primaltrek.com/blog/category/japanese-coins/">Japanese coins</a> (1) </li> <li class="cat-item cat-item-9"><a href="https://primaltrek.com/blog/category/korean-charms/">Korean charms</a> (2) </li> <li class="cat-item cat-item-14"><a href="https://primaltrek.com/blog/category/silk-road-coins/">Silk Road coins</a> (2) </li> <li class="cat-item cat-item-1"><a href="https://primaltrek.com/blog/category/uncategorized/">Uncategorized</a> (17) </li> <li class="cat-item cat-item-13"><a href="https://primaltrek.com/blog/category/vietnamese-charms/">Vietnamese coins and charms</a> (2) </li> </ul> </div><div class="widget widget_archive" id="archives-3"><p class="widget_title">Archives</p> <ul> <li><a href='https://primaltrek.com/blog/2021/03/' aria-current="page">March 2021</a> (3)</li> <li><a href='https://primaltrek.com/blog/2021/02/'>February 2021</a> (2)</li> <li><a href='https://primaltrek.com/blog/2021/01/'>January 2021</a> (3)</li> <li><a href='https://primaltrek.com/blog/2020/12/'>December 2020</a> (2)</li> <li><a href='https://primaltrek.com/blog/2016/11/'>November 2016</a> (2)</li> <li><a href='https://primaltrek.com/blog/2016/10/'>October 2016</a> (2)</li> <li><a href='https://primaltrek.com/blog/2016/02/'>February 2016</a> (3)</li> <li><a href='https://primaltrek.com/blog/2016/01/'>January 2016</a> (1)</li> <li><a href='https://primaltrek.com/blog/2015/10/'>October 2015</a> (1)</li> <li><a href='https://primaltrek.com/blog/2015/09/'>September 2015</a> (2)</li> <li><a href='https://primaltrek.com/blog/2015/08/'>August 2015</a> (3)</li> <li><a href='https://primaltrek.com/blog/2015/07/'>July 2015</a> (3)</li> <li><a href='https://primaltrek.com/blog/2015/06/'>June 2015</a> (3)</li> <li><a href='https://primaltrek.com/blog/2015/05/'>May 2015</a> (3)</li> <li><a href='https://primaltrek.com/blog/2015/04/'>April 2015</a> (1)</li> <li><a href='https://primaltrek.com/blog/2015/03/'>March 2015</a> (2)</li> <li><a href='https://primaltrek.com/blog/2015/02/'>February 2015</a> (2)</li> <li><a href='https://primaltrek.com/blog/2015/01/'>January 2015</a> (2)</li> <li><a href='https://primaltrek.com/blog/2014/12/'>December 2014</a> (3)</li> <li><a href='https://primaltrek.com/blog/2014/11/'>November 2014</a> (1)</li> <li><a href='https://primaltrek.com/blog/2013/12/'>December 2013</a> (1)</li> <li><a href='https://primaltrek.com/blog/2013/11/'>November 2013</a> (1)</li> <li><a href='https://primaltrek.com/blog/2013/10/'>October 2013</a> (2)</li> <li><a href='https://primaltrek.com/blog/2013/09/'>September 2013</a> (3)</li> <li><a href='https://primaltrek.com/blog/2013/08/'>August 2013</a> (1)</li> <li><a href='https://primaltrek.com/blog/2013/07/'>July 2013</a> (2)</li> <li><a href='https://primaltrek.com/blog/2013/06/'>June 2013</a> (2)</li> <li><a href='https://primaltrek.com/blog/2013/05/'>May 2013</a> (5)</li> <li><a href='https://primaltrek.com/blog/2013/04/'>April 2013</a> (3)</li> <li><a href='https://primaltrek.com/blog/2013/03/'>March 2013</a> (1)</li> <li><a href='https://primaltrek.com/blog/2013/02/'>February 2013</a> (3)</li> <li><a href='https://primaltrek.com/blog/2013/01/'>January 2013</a> (4)</li> <li><a href='https://primaltrek.com/blog/2012/12/'>December 2012</a> (2)</li> <li><a href='https://primaltrek.com/blog/2012/11/'>November 2012</a> (2)</li> <li><a href='https://primaltrek.com/blog/2012/10/'>October 2012</a> (2)</li> <li><a href='https://primaltrek.com/blog/2012/09/'>September 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/08/'>August 2012</a> (2)</li> <li><a href='https://primaltrek.com/blog/2012/07/'>July 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/06/'>June 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/05/'>May 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/04/'>April 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/03/'>March 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2012/02/'>February 2012</a> (2)</li> <li><a href='https://primaltrek.com/blog/2012/01/'>January 2012</a> (1)</li> <li><a href='https://primaltrek.com/blog/2011/12/'>December 2011</a> (2)</li> <li><a href='https://primaltrek.com/blog/2011/11/'>November 2011</a> (5)</li> <li><a href='https://primaltrek.com/blog/2011/10/'>October 2011</a> (5)</li> <li><a href='https://primaltrek.com/blog/2011/09/'>September 2011</a> (8)</li> <li><a href='https://primaltrek.com/blog/2011/08/'>August 2011</a> (6)</li> <li><a href='https://primaltrek.com/blog/2011/07/'>July 2011</a> (7)</li> <li><a href='https://primaltrek.com/blog/2011/06/'>June 2011</a> (8)</li> <li><a href='https://primaltrek.com/blog/2011/05/'>May 2011</a> (16)</li> </ul> </div> </div> </div> <div data-rocket-location-hash="027bee8e91fb0268a1da600109edaec3" class="footer"> </div> </div> <script type="rocketlazyloadscript" data-rocket-type="text/javascript" id="rocket-browser-checker-js-after"> /* <![CDATA[ */ "use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||!1,descriptor.configurable=!0,"value"in descriptor&&(descriptor.writable=!0),Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){return protoProps&&defineProperties(Constructor.prototype,protoProps),staticProps&&defineProperties(Constructor,staticProps),Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor))throw new TypeError("Cannot call a class as a function")}var RocketBrowserCompatibilityChecker=function(){function RocketBrowserCompatibilityChecker(options){_classCallCheck(this,RocketBrowserCompatibilityChecker),this.passiveSupported=!1,this._checkPassiveOption(this),this.options=!!this.passiveSupported&&options}return _createClass(RocketBrowserCompatibilityChecker,[{key:"_checkPassiveOption",value:function(self){try{var options={get passive(){return!(self.passiveSupported=!0)}};window.addEventListener("test",null,options),window.removeEventListener("test",null,options)}catch(err){self.passiveSupported=!1}}},{key:"initRequestIdleCallback",value:function(){!1 in window&&(window.requestIdleCallback=function(cb){var start=Date.now();return setTimeout(function(){cb({didTimeout:!1,timeRemaining:function(){return Math.max(0,50-(Date.now()-start))}})},1)}),!1 in window&&(window.cancelIdleCallback=function(id){return clearTimeout(id)})}},{key:"isDataSaverModeOn",value:function(){return"connection"in navigator&&!0===navigator.connection.saveData}},{key:"supportsLinkPrefetch",value:function(){var elem=document.createElement("link");return elem.relList&&elem.relList.supports&&elem.relList.supports("prefetch")&&window.IntersectionObserver&&"isIntersecting"in IntersectionObserverEntry.prototype}},{key:"isSlowConnection",value:function(){return"connection"in navigator&&"effectiveType"in navigator.connection&&("2g"===navigator.connection.effectiveType||"slow-2g"===navigator.connection.effectiveType)}}]),RocketBrowserCompatibilityChecker}(); /* ]]> */ </script> <script type="text/javascript" id="rocket-preload-links-js-extra"> /* <![CDATA[ */ var RocketPreloadLinksConfig = {"excludeUris":"\/blog(\/(?:.+\/)?feed(?:\/(?:.+\/?)?)?$|\/(?:.+\/)?embed\/|\/(index.php\/)?(.*)wp-json(\/.*|$))|\/refer\/|\/go\/|\/recommend\/|\/recommends\/","usesTrailingSlash":"1","imageExt":"jpg|jpeg|gif|png|tiff|bmp|webp|avif|pdf|doc|docx|xls|xlsx|php","fileExt":"jpg|jpeg|gif|png|tiff|bmp|webp|avif|pdf|doc|docx|xls|xlsx|php|html|htm","siteUrl":"https:\/\/primaltrek.com\/blog","onHoverDelay":"100","rateThrottle":"3"}; /* ]]> */ </script> <script type="rocketlazyloadscript" data-rocket-type="text/javascript" id="rocket-preload-links-js-after"> /* <![CDATA[ */ (function() { "use strict";var r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},e=function(){function i(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}return function(e,t,n){return t&&i(e.prototype,t),n&&i(e,n),e}}();function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var t=function(){function n(e,t){i(this,n),this.browser=e,this.config=t,this.options=this.browser.options,this.prefetched=new Set,this.eventTime=null,this.threshold=1111,this.numOnHover=0}return e(n,[{key:"init",value:function(){!this.browser.supportsLinkPrefetch()||this.browser.isDataSaverModeOn()||this.browser.isSlowConnection()||(this.regex={excludeUris:RegExp(this.config.excludeUris,"i"),images:RegExp(".("+this.config.imageExt+")$","i"),fileExt:RegExp(".("+this.config.fileExt+")$","i")},this._initListeners(this))}},{key:"_initListeners",value:function(e){-1<this.config.onHoverDelay&&document.addEventListener("mouseover",e.listener.bind(e),e.listenerOptions),document.addEventListener("mousedown",e.listener.bind(e),e.listenerOptions),document.addEventListener("touchstart",e.listener.bind(e),e.listenerOptions)}},{key:"listener",value:function(e){var t=e.target.closest("a"),n=this._prepareUrl(t);if(null!==n)switch(e.type){case"mousedown":case"touchstart":this._addPrefetchLink(n);break;case"mouseover":this._earlyPrefetch(t,n,"mouseout")}}},{key:"_earlyPrefetch",value:function(t,e,n){var i=this,r=setTimeout(function(){if(r=null,0===i.numOnHover)setTimeout(function(){return i.numOnHover=0},1e3);else if(i.numOnHover>i.config.rateThrottle)return;i.numOnHover++,i._addPrefetchLink(e)},this.config.onHoverDelay);t.addEventListener(n,function e(){t.removeEventListener(n,e,{passive:!0}),null!==r&&(clearTimeout(r),r=null)},{passive:!0})}},{key:"_addPrefetchLink",value:function(i){return this.prefetched.add(i.href),new Promise(function(e,t){var n=document.createElement("link");n.rel="prefetch",n.href=i.href,n.onload=e,n.onerror=t,document.head.appendChild(n)}).catch(function(){})}},{key:"_prepareUrl",value:function(e){if(null===e||"object"!==(void 0===e?"undefined":r(e))||!1 in e||-1===["http:","https:"].indexOf(e.protocol))return null;var t=e.href.substring(0,this.config.siteUrl.length),n=this._getPathname(e.href,t),i={original:e.href,protocol:e.protocol,origin:t,pathname:n,href:t+n};return this._isLinkOk(i)?i:null}},{key:"_getPathname",value:function(e,t){var n=t?e.substring(this.config.siteUrl.length):e;return n.startsWith("/")||(n="/"+n),this._shouldAddTrailingSlash(n)?n+"/":n}},{key:"_shouldAddTrailingSlash",value:function(e){return this.config.usesTrailingSlash&&!e.endsWith("/")&&!this.regex.fileExt.test(e)}},{key:"_isLinkOk",value:function(e){return null!==e&&"object"===(void 0===e?"undefined":r(e))&&(!this.prefetched.has(e.href)&&e.origin===this.config.siteUrl&&-1===e.href.indexOf("?")&&-1===e.href.indexOf("#")&&!this.regex.excludeUris.test(e.href)&&!this.regex.images.test(e.href))}}],[{key:"run",value:function(){"undefined"!=typeof RocketPreloadLinksConfig&&new n(new RocketBrowserCompatibilityChecker({capture:!0,passive:!0}),RocketPreloadLinksConfig).init()}}]),n}();t.run(); }()); /* ]]> */ </script> <script>window.lazyLoadOptions=[{elements_selector:"img[data-lazy-src],.rocket-lazyload",data_src:"lazy-src",data_srcset:"lazy-srcset",data_sizes:"lazy-sizes",class_loading:"lazyloading",class_loaded:"lazyloaded",threshold:300,callback_loaded:function(element){if(element.tagName==="IFRAME"&&element.dataset.rocketLazyload=="fitvidscompatible"){if(element.classList.contains("lazyloaded")){if(typeof window.jQuery!="undefined"){if(jQuery.fn.fitVids){jQuery(element).parent().fitVids()}}}}}},{elements_selector:".rocket-lazyload",data_src:"lazy-src",data_srcset:"lazy-srcset",data_sizes:"lazy-sizes",class_loading:"lazyloading",class_loaded:"lazyloaded",threshold:300,}];window.addEventListener('LazyLoad::Initialized',function(e){var lazyLoadInstance=e.detail.instance;if(window.MutationObserver){var observer=new MutationObserver(function(mutations){var image_count=0;var iframe_count=0;var rocketlazy_count=0;mutations.forEach(function(mutation){for(var i=0;i<mutation.addedNodes.length;i++){if(typeof mutation.addedNodes[i].getElementsByTagName!=='function'){continue} if(typeof mutation.addedNodes[i].getElementsByClassName!=='function'){continue} images=mutation.addedNodes[i].getElementsByTagName('img');is_image=mutation.addedNodes[i].tagName=="IMG";iframes=mutation.addedNodes[i].getElementsByTagName('iframe');is_iframe=mutation.addedNodes[i].tagName=="IFRAME";rocket_lazy=mutation.addedNodes[i].getElementsByClassName('rocket-lazyload');image_count+=images.length;iframe_count+=iframes.length;rocketlazy_count+=rocket_lazy.length;if(is_image){image_count+=1} if(is_iframe){iframe_count+=1}}});if(image_count>0||iframe_count>0||rocketlazy_count>0){lazyLoadInstance.update()}});var b=document.getElementsByTagName("body")[0];var config={childList:!0,subtree:!0};observer.observe(b,config)}},!1)</script><script data-no-minify="1" async src="https://primaltrek.com/blog/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.js"></script><script type="rocketlazyloadscript">(function(d,g){d[g]||(d[g]=function(g){return this.querySelectorAll("."+g)},Element.prototype[g]=d[g])})(document,"getElementsByClassName");(function(){var classes = document.getElementsByClassName('menu_control');for (i = 0; i < classes.length; i++) {classes[i].onclick = function() {var menu = this.nextElementSibling;if (/show_menu/.test(menu.className))menu.className = menu.className.replace('show_menu', '').trim();else menu.className += ' show_menu';if (/menu_control_triggered/.test(this.className))this.className = this.className.replace('menu_control_triggered', '').trim();else this.className += ' menu_control_triggered';};}})();</script> <script>var rocket_beacon_data = {"ajax_url":"https:\/\/primaltrek.com\/blog\/wp-admin\/admin-ajax.php","nonce":"baa33c9a16","url":"https:\/\/primaltrek.com\/blog\/2021\/03","is_mobile":false,"width_threshold":1600,"height_threshold":700,"delay":500,"debug":null,"status":{"atf":true,"lrc":true},"elements":"img, video, picture, p, main, div, li, svg, section, header, span","lrc_threshold":1800}</script><script data-name="wpr-wpr-beacon" src='https://primaltrek.com/blog/wp-content/plugins/wp-rocket/assets/js/wpr-beacon.min.js' async></script></body> </html> <!-- This website is like a Rocket, isn't it? Performance optimized by WP Rocket. Learn more: https://wp-rocket.me -->