Dong Nguyen

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The way you write CSS selectors does play a role in how browsers render your web pages. This heavily depends on the web page, the size of the DOM tree, the amount of CSS rules, and whether the DOM changes often. Microsoft Edge DevTools has a Performance tool that can be a real eye opener when your app starts feeling slow.

The truth about CSS selector performance

A good read. This can be very useful when the user has options to change CSS option. Too many changes can make a delay that annoys the user. Using the right selectors reduces that delay

Is this the reason the CSS preprocessors were born?

This is a great tool, and it looks like other browsers are adding it now too!

I always thought of CSS as the dumpyard to add as many styles as possible. I mean instead of using Javascript to apply styles. But this gives a good understanding of how CSS impacts a web page.