[Webkit-unassigned] [Bug 276942] Attribute selectors and nested selectors crash the tab repeatedly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276942

--- Comment #13 from @fregante <bugs at bfred.it> ---
I have a couple of updates:

There are two manifestations of this bug:
  - one that crashes immediately when a specific selector is found, even if empty and non-matching
  - one that crashes sometime later, probably as a combination of multiple rules 

The immediate crash repro is:

```css
[hidden] {svg {}}
```

I haven't been able to isolate the latter, it takes too long to repro. It seems that that both are related to attributes and definitely related to nested selectors.

I ended up using a transpiler to flatten all of my selectors because this bug completely killed my extension once again. Without nested selectors, both manifestations are now finally fixed.

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