Annotate the visitor arrays and cast the `VisitorMap` / visitor params, matching
the strict test-suite typing introduced on main (#21147), so the two added
`as: "block-contents"` tests pass `tsc -p tsconfig.types.test.json`.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

…option (#21157)

* feat: resolve url() inside HTML style attributes via CSS parser "as" option

Add a CSS parser `as` option (default `"stylesheet"`) that selects the
parse entry point. With `as: "declaration-list"` the source is parsed as a
block's contents (CSS Syntax §5.4.5) instead of a full stylesheet, which is
the correct model for an element's `style="..."` attribute.

HTML modules now route URL-bearing `style` attributes through the CSS
pipeline (via the new `html-style-attribute` dependency category, parsed
with `as: "declaration-list"`), so `url()` / `image-set()` references in
inline styles resolve relative to the HTML file.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): inject the top-level consumer into the CSS walk

Instead of switching on an `as` string inside `grammar`, `SourceProcessor`
now accepts a `consume` driver (a `TopLevelConsumer`) and defaults to the
stylesheet consumer. `consumeADeclarationList` is exported as a reusable
driver, and `CssParser` maps its `as` option to it — so the walk no longer
hardcodes how the source is parsed.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): drive the walk through the spec parse* entry points

The injectable top-level driver now routes through the §5.3 `parse*`
functions instead of the §5.4 `consume*` internals: the default uses
`parseAStylesheetsContents` and a `style` attribute uses the new
`parseADeclarationList` ("parse a block's contents", §5.3.6). Both receive
the already-built `TokenStream`, which `normalizeIntoTokenStream` returns
as-is, so there is no re-tokenization. `parseAStylesheetsContents` gains the
same optional streaming `onRule` sink `consumeAStylesheetsContents` already
had, so the default path keeps its rule-by-rule memory profile.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): use parseABlocksContents directly for style attributes

Drop the `parseADeclarationList` wrapper — its name reflects the old spec
term "parse a list of declarations", which CSS Syntax renamed to "parse a
block's contents". CssParser now builds the `style`-attribute top-level
parser straight from `parseABlocksContents` (§5.3.6), reusing the existing
token stream as before.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): pass parseAStylesheet / parseABlocksContents as the walk driver

Drop the "declaration-list" terminology and the grammar's internal default.
`SourceProcessor#process` now requires the caller to pass the top-level parse
entry point, and CssParser passes one of the spec §5.3 functions directly:
`parseAStylesheet` for a stylesheet, `parseABlocksContents` for a block's
contents (the `as: "block"` mode, e.g. an HTML `style` attribute). The walk
reuses the existing token stream and walks the returned nodes. Revert the
now-unused streaming `onRule` extension on `parseAStylesheetsContents`.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): align `as` value with CSS spec and drop dead onRule

Rename the `style` attribute parse mode from `as: "block"` to
`as: "block-contents"` so the option values match the CSS Syntax §5.3 entry
points ("parse a block's contents" / "parse a stylesheet"), leaving room for
future spec-named modes. Also remove the now-unused `onRule` streaming param
from `consumeAStylesheetsContents`.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): keep stylesheet streaming intact, make block-contents purely additive

Restore the original "consume a stylesheet's contents" streaming driver
(`consumeAStylesheetsContents(ts, onRule)`) for the default `as: "stylesheet"`
mode — the spec parse logic is unchanged. The `as: "block-contents"` mode is
now a small additive branch in the walk's grammar that parses a block's
contents instead. Drops the `TopLevelParser` indirection.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* refactor(css): drive the walk through a uniform top-level consumer table

Give `consumeABlocksContents` the same streaming `onNode` callback that
`consumeAStylesheetsContents` already exposes, so both share a `(ts, onNode)`
shape. The walk's `grammar` now dispatches `as` through a `TOP_LEVEL_CONSUMERS`
map instead of a branch — a future `as` mode is one map entry, no new walk
code, and every mode streams (no full AST retained).

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* chore: rename changeset file to match block-contents terminology

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* feat(html): add stylesheet-style-attribute source type, rename stylesheet-inline

Let developers route a custom HTML attribute's value through the CSS pipeline
as a block's contents (a declaration list, like a `style` attribute) via the
new `stylesheet-style-attribute` source type, alongside `stylesheet-style` for
a full inline stylesheet. Renames the experimental `stylesheet-inline` type to
`stylesheet-style` so the inline pair mirrors `<style>` / `style=`.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX

* test(css): strictly type the new block-contents walk tests

Annotate the visitor arrays and cast the `VisitorMap` / visitor params, matching
the strict test-suite typing introduced on main (#21147), so the two added
`as: "block-contents"` tests pass `tsc -p tsconfig.types.test.json`.

https://claude.ai/code/session_01RtuVwAXk4wSAPE85d8qadX