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performance
Sitespeed.io is a set of Open Source tools that makes it easy to monitor and measure the performance of your web site.
Yet another Lazy Loading JavaScript library, why?<br><br>Existing lazy loading libraries hook up to the scroll event or use a periodic timer and call getBoundingClientRect() on elements that need to be lazy loaded. This approach, however, is painfully slow as each call to getBoundingClientRect() forces the browser to re-layout the entire page and will introduce considerable jank to your website.<br><br>Making this more efficient and performant is what IntersectionObserver is designed for, and it’s landed in Chrome 51. IntersectionObservers let you know when an observed element enters or exits the browser’s viewport.
Lara is donating all of the proceeds from the book to various charities focused on getting girls and women into coding, including Girl Develop It, Women Who Code, and DonorsChoose projects like Growing "Girls with Gadgets"! and Girls Can Code, Too!. So if you enjoy the book, please consider buying it!