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With style rules nested inside `@media` and `@support` conditions, it's a bit difficult to determine if a style rule applies to an element. Is it possible to expose a `matches` method that would do th…
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Apologies if this is not the right place to post this.
Although I'm sure this spec is ancient, is it not incorrect to report `` as an offsetParent when the body is statically positioned, as it is by …
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Currently there's no reliable way to get the small/large viewport dimensions.
There are some tricks in the wild for working with these values like inserting an element with something like `height:…
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### WebKittens
@annevk @smfr
### Title of the spec
window.onmove
### URL to the spec
https://html.spec.whatwg.org/multipage/webappapis.html#event-handlers-on-elements,-document-objects,…
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[`elementFromPoint`](https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint) and [`elementsFromPoint`](https://drafts.csswg.org/cssom-view/#dom-document-elementsfrompoint) should not retur…
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https://drafts.csswg.org/cssom-view/#extensions-to-the-window-interface
> The innerWidth attribute must return the viewport width including the size of a rendered scroll bar \(if any\), or zero if …
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Suggested fix:
CSSStyleSheet.js:39
```javascript
CSSOM.CSSStyleSheet.prototype.insertRule = function(rule, index = this.cssRules.length) {
```
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Since we already have all the properties defined in the spec it would be handy to create the IDL definitions per spec as well.
Currently we do some hand-wavy stuff in CSSOM that is very generic.
You…
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One of the big challenges in automated accessibility testing is to test for color contrast. And one of the biggest challenges in testing for color contrast is to figure out what is going on with pseud…
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Apparently there are invalid types (see #9534):
> type can accept any idents, except 'none' or '-ua-' prefixes
I would suggest throwing a TypeError or a SyntaxError when these are used in DOM APIs…