css-validator
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w3c
W3C CSS Validation Service
css-validator will mark any instance of the `contain-intrinsic-size` property as a failure. Related: [commit 3591111](https://github.com/w3c/css-validator/commit/3591111aab91501123d79a46f2b1704ba4b0d430). Will update with a test-case soon.
The `@supports` at-rule now supports the `selector()` function [as of CSS conditionals level 4](https://www.w3.org/TR/css-conditional-4/#at-supports-ext). Safari, Chromium, Edge, and Firefox have shipped support. The CSS validator and Nu validator fail to...
Minimal example: Enter the following code in https://jigsaw.w3.org/css-validator/#validate_by_input for validation (with at least one blank line before comment): ``` /* */ } ``` Result: No error found !
Will create PRs to update the submodules when they change, and also for GitHub Actions versions
Should support the CSS `env()` function: https://developer.mozilla.org/en-US/docs/Web/CSS/env() https://drafts.csswg.org/css-env/#env-function
Like `@media screen { }`giving `@media screen` in the output, or improper `{` in the case of nested @rules.
I find it impossible to validate styles on error pages (e.g. HTTP 404). There is no such option in the web interface and I do not find such [parameter](https://jigsaw.w3.org/css-validator/manual.html#requestformat) in...
I have a collection of CSS code to be validated and was sending GET requests with url encoded code as a `text` query parameter. For a large fraction of them,...
Validate the following fragment while treating vendor extensions as warnings: ```css ::-webkit-scrollbar:vertical { border: 1px solid black; } ``` The validator will report the `::-webkit-scrollbar` pseudo-element vendor extension as a...
