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conformance · v138
v138 · add-prefetchcache-and-prerendercache-to-clear-site-data-header — conformance probe
5 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.
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pass
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fail
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blocked
5
total
| id | contract | kind | verdict | detail |
|---|---|---|---|---|
speculation-rules-supported |
The user agent supports speculation rules, which is the cache surface that Clear-Site-Data must be able to address. spec ↗ | exists | … | |
supports-prefetch-rules |
HTMLScriptElement.supports('speculationrules') reports support, so prefetchCache has something to clear. spec ↗ | script | … | |
clear-site-data-header-name-static |
Clear-Site-Data is a response header — value tokens are server-set strings. The two new tokens are exact ASCII literals 'prefetchCache' and 'prerenderCache' (camelCase, not kebab). spec ↗ | script | … | |
clear-site-data-fetch-roundtrip |
A fetch() that asks the server to echo a Clear-Site-Data header containing prefetchCache succeeds without throwing; the token does not invalidate the header for parsing purposes. spec ↗ | script | … | |
prerender-via-speculation-rules-accepted |
A speculation rules script using prerender action parses without throwing — confirming the cache surface this header targets exists. spec ↗ | script | … |