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Building the DOM faster: speculative parsing, async, defer and preload In 2017, the toolbox for making sure your web page loads fast includes everything from minification and asset optimization to caching, CDNs, code splitting and tree shaking. However, you can get big performance boosts with just a few keywords and mindful code structuring, even if youâre not yet familiar with the concepts above
How it worksthe in operator returns true if the specified property is in the specified object. source: MDN So? .. it checks if property exists not the value of it. then what can go wrong ? WhyI always had something against in, mainly because it sounds a bit over promising. The first time I used it I was expecting a behavior more like includes, just because the word âinâ is very suggestive to infor
The CSS box model is rather complicated, particularly when it comes to scrolling content. While the browser uses the values from your CSS to draw boxes, determining all the dimensions using JS is not straight-forward if you only have the CSS. That's why each element has six DOM properties for your convenience: offsetWidth, offsetHeight, clientWidth, clientHeight, scrollWidth and scrollHeight. Thes
As you can see, the browsers seem to have settled on at least one reliable property; innerHeight. Internet Explorer took a long time to make up its mind, and its influence means that other browsers change their clientHeight behaviour in different versions in order to match it. For now, almost all browsers provide window.innerHeight/Width so that can be used. The other values may swap the values ar
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Published: March 31, 2014 The foundation of every solid performance strategy is good measurement and instrumentation. You can't optimize what you can't measure. This guide explains different approaches for measuring critical rendering path (CRP) performance. The Lighthouse approach runs a series of automated tests against a page, and then generates a report on the page's CRP performance. This appr
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