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When the HTML parser blocks on a synchronous external script, run a separate tokenizer over the unparsed input and issue speculative fetches for the resources it finds (script src, link rel=stylesheet|preload, img src), with <base href> tracking and template/foreign-content skipping. Also fills in the previously-stubbed "consume a preloaded resource" algorithm and the document's "map of preloaded resources", so that <link rel="preload"> followed by a matching consumer deduplicates to a single fetch.
38 lines
1.6 KiB
HTML
38 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<script src="../../include.js"></script>
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<!--
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This test exercises the speculative HTML parser code path: when the parser blocks on a
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synchronous external <script>, the speculative parser walks the unparsed input and emits
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speculative fetches for resources it finds (links, images, scripts), with appropriate
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skipping inside <template> and foreign-content subtrees.
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The script above (include.js) is a sync external blocking script. While the parser is
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blocked waiting for it, the speculative parser scans the rest of the document below.
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The page below intentionally contains a variety of constructs to exercise the various
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code paths in SpeculativeHTMLParser::process_start_tag and speculative_fetch:
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- <link rel=stylesheet> (style fetch)
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- <link rel=preload as=image> (preload fetch)
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- <img src> (image fetch)
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- <base href> (base URL update)
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- <template><script src=trap.js></template> (skipped — inside template)
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- <svg><script href=trap.js></svg> (skipped — inside foreign content)
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- duplicate URLs (deduped via list_of_speculative_fetch_urls)
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The test passes if the page loads to completion without crashing and the test() callback
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runs as expected.
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-->
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<base href="./does-not-matter/">
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<link rel="stylesheet" href="./does-not-exist.css">
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<link rel="preload" as="image" href="./does-not-exist.png">
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<img src="./does-not-exist.png">
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<img src="./does-not-exist.png">
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<template><script src="./trap.js"></script></template>
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<svg><script href="./trap.js"></script></svg>
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<script>
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test(() => {
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println("speculative HTML parser smoke test: OK");
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});
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</script>
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