Similar to what I wrote for caret-color in January, this is a blog post about the process to implement a new feature on Chromium/Blink. This time it’s the turn for :focus-within pseudo-class from the Selectors 4 spec, I’ll talk about the different things that happened during the development. :focus-within pseudo-class # This is a new selector that allows to modify the style of an element when this
![Adding :focus-within selector to Chromium](https://cdn-ak-scissors.b.st-hatena.com/image/square/904693d73cea6b1d7d8f6ad47b48d6bfde023b21/height=288;version=1;width=512/https%3A%2F%2Fblogs.igalia.com%2Fmrego%2Ffiles%2F2014%2F03%2Figalia-bloomberg.png)