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:watch-attrs(...)
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@ -85,6 +85,27 @@ Use to negate other procedural selectors. For example `:not(:has(.foo))` will ma
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Note that if _arg_ is valid CSS selector, uBO will not consider the `:not` operator to be a procedural one, it will rather consider the operator as being part of a CSS selector. Thus this ensure compatibility with the existing
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[CSS `:not(...)` pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:not).
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### `subject:watch-attrs(arg)`
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Experimental.
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- Description: Pass-through filter used to modify behavior of the procedural cosmetic filter engine by forcing re-evaluation when one or more attribute changes on the matching elements.
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- Chainable: Yes.
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- _subject_: Can be a plain CSS selector, or a procedural cosmetic filter.
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- _arg_: comma-separate list of attribute names. No argument means watch changes of any one attribute.
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Introduced in uBO [1.17.5rc3](https://github.com/gorhill/uBlock/commit/8a88e9d93174badd6855c0e782737158c9ccd6f8)
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Solves [uBlockOrigin/uBlock-issues#341 (comment)](https://github.com/uBlockOrigin/uBlock-issues/issues/341#issuecomment-449764612) (overlay dialog used for two purposes, differ only by class name in child node).
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By default hiding by procedural filters is reevaluated only when nodes in sub-tree are added or removed - uBO does not watch for attribute changes for performance reasons. This filter instructs uBO procedural filtering engine to watch for changes in specific attributes.
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Example:
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- `vivrehome.pl##.js-popup-register:has(.js-title-default.is-hidden:watch-attributes(class))` blocks the "Register" overlay when first visiting the site, but yet allow the "Register" overlay when clicking "rejestracja".
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- `ameshkov.github.io###testdiv:watch-attrs(id):has(p)` demo, detects `id` changes.
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### `subject:xpath(arg)`
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- Description: Create a new set of elements by evaluating a XPath using _subject_ as the context node (optional) and _arg_ as the expression.
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