Chapter 4: Optimizing CSS: ID Selectors and Other Myths
by Ivan Čurić
In today’s typical scenario, where the average website ships 500KB of gzipped JavaScript and 1.5MB of images, running on a midrange Android device via 3G with a 400ms round trip time, CSS selector performance is the least of our problems.
Still, there’s something to be said about the topic, especially to weed out some of the myths and legends surrounding them. So let’s dive right in.
The Basics of CSS Parsing
First, to get on the same page — this article isn’t about the performance of CSS properties and values. What we’re covering here is the performance cost of the selectors themselves. I'll be focusing on the Blink rendering engine, specifically Chrome 62.
The selectors ...
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