[filter-effects-1] Add filter()
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SebastianZ
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Apr 11, 2025
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The syntax for the filter() function is:
filter() = filter( [ <image> | <string> ], <filter-value-list> )So three annotations:
- The first parameter can also be a
<string>. Though that's a bit strange, because the spec. doesn't define what this value refers to. I'll try to dig deeper and may create a spec. issue for that. - The second parameter is a
<filter-value-list>. That means we should have at least one test for multiple filters. <image>includes more than just gradients and URLs. So maybe we should add a few tests regarding those other values.
| }, | ||
| tests: [ | ||
| // filter() = filter( [ <image> | <string> ], <filter-value-list> ) | ||
| 'filter(conic-gradient(red), invert(1))', |
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Single-stop gradients were only added recently, as far as I know. So I wouldn't include those in the tests for filter().
Generally, I don't think it is necessary to test (so many) different gradient syntaxes here. One basic test per gradient function or even just one for gradients in general should be fine.
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Currently, only Safari supports it: https://caniuse.com/css-filter-function