testing/web-platform/tests/conformance-checkers/html/elements/picture/always-matching-source-media-all-spaces-with-following-source-srcset-novalid.html


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<!DOCTYPE html>
<meta charset=utf-8>
<title>invalid always-matching-source-media-all-spaces-with-following-source-srcset</title>
<picture><source srcset=x media=' all '><source srcset=x><img src=x alt></picture>