Wrap responsive image styles in @layer astro.images to respect CSS cascade layers#17141
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I tried this and can confirm it works as expected. |
matthewp
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This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [astro](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/astro)) | [`7.0.0` → `7.0.2`](https://renovatebot.com/diffs/npm/astro/7.0.0/7.0.2) |  |  | --- ### Release Notes <details> <summary>withastro/astro (astro)</summary> ### [`v7.0.2`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#702) [Compare Source](https://github.com/withastro/astro/compare/astro@7.0.1...astro@7.0.2) ##### Patch Changes - Updated dependencies \[[`3b5e994`](withastro/astro@3b5e994)]: - [@​astrojs/markdown-satteri](https://github.com/astrojs/markdown-satteri)@​0.3.2 ### [`v7.0.1`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#701) [Compare Source](https://github.com/withastro/astro/compare/astro@7.0.0...astro@7.0.1) ##### Patch Changes - [#​17151](withastro/astro#17151) [`ccceda3`](withastro/astro@ccceda3) Thanks [@​matthewp](https://github.com/matthewp)! - Fixes `astro dev` incorrectly starting in background mode for Warp terminal users. Hybrid environments like Warp are no longer treated as AI agents for auto-background detection. - [#​17158](withastro/astro#17158) [`164df87`](withastro/astro@164df87) Thanks [@​ematipico](https://github.com/ematipico)! - Fixes `astro dev --background --host` not listing the network addresses. The background server start output and `astro dev status` now show every exposed network URL, matching the foreground dev server. - [#​17141](withastro/astro#17141) [`d785b9d`](withastro/astro@d785b9d) Thanks [@​astrobot-houston](https://github.com/astrobot-houston)! - Fixes responsive image CSS overriding user styles defined inside CSS `@layer` blocks. The generated image styles are now wrapped in `@layer astro.images`, ensuring they have lower cascade priority than user-defined layers. - [#​17150](withastro/astro#17150) [`1a61386`](withastro/astro@1a61386) Thanks [@​matthewp](https://github.com/matthewp)! - Fixes `astro dev --background` failing on Windows with "Failed to spawn background dev server process" </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](undefined) if that's undesired. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yMzQuMCIsInVwZGF0ZWRJblZlciI6IjQzLjIzNC4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->
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Closes #17139
Changes
generateImageStylesCSS()in@layer astro.images { … }. Per the CSS cascade spec, unlayered styles always beat layered styles regardless of specificity — so the previous unlayered:where([data-astro-image=constrained]){max-width:100%}was silently overriding any usermax-widthdefined inside a@layer, even though:where()has zero specificity. Putting these defaults into a named layer restores the original intent of:where(): Astro's image styles should always be easy for users to override.astro.imagesuses a dotted namespace to avoid collisions with user-defined layer names while remaining valid for CSS processors (e.g. lightningcss).astro.imagessits below your own layers, declare the order explicitly:@layer astro.images, layout, page, components;. Without an explicit order declaration, the first-seen layer wins — which may or may not beastro.imagesdepending on stylesheet load order.Testing
packages/astro/test/units/assets/utils.test.tsto expect the@layer astro.images { … }wrapper around the generated CSS output.Docs
image.responsiveStylesis already documented as producing overridable defaults; this fix makes that promise actually true when users write CSS layers.