CSS's !important was added for one reason only

• nitter

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One of the reasons I installed an add-on to redirect twitter links to https://nitter.net/

• webcomponents

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  Web Components specifications

  

this is called an html module: https://github.com/WICG/webcomponents/blob/gh-pages/proposal...

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• Svelte

  632 76,553 9.9 JavaScript

  Cybernetically enhanced web apps

  

> It suffices to simply provide some way to pass this class from a parent to a child, for example, and let the child component decide what to do with it.

Again, the child component can't decide what to do with a class, as it can't know specifics about the parent. It would break the modularity.

I checked the most commented issue, it's about the reactivity system doing only one round of checking in topological ordering, which could be fixed, but could cause infinite loop, and again the problem is not implementation, but deciding on the best design:

https://github.com/sveltejs/svelte/issues?q=is%3Aissue+is%3A...

• uBlock

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  uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.

Zapper is a special feature, entirely unrelated to cosmetic filtering. When you zap an element, the element is removed from the DOM, and the zapper code will also look at the DOM to find out if any of the parent elements are scroll-locked, and if so will defuse it with an inline style using `!important`.[1]

As for cosmetic filtering, it's is the hiding of elements using `display: none !important;` to ensure page styles are overridden.[2]

* * *

[1] https://github.com/gorhill/uBlock/blob/12ab8664a30538570d395...

[2] https://github.com/gorhill/uBlock/blob/12ab8664a30538570d395...

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