Prefer `defer` Over `async`

Every week I analyze a handful of websites for rendering performance. The main culprit blocking rendering is JavaScript execution. Frequently, I notice this blocking JavaScript is loaded with the ASYNC tag. Wha?! Shouldn’t ASYNC not block rendering? Sadly, no. Not...

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Author: CSS-Tricks

CSS-Tricks, a web design community curated by Chris Coyier.

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