html base element - forbid href with data or javascript url #20646
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The
hrefin the<base>element disallowsdata:andjavascript:URLs in a recent spec change. Note however that Chrome and Safari already obey this rule. FF does not - but will in https://bugzilla.mozilla.org/show_bug.cgi?id=1850967This was tested using first test in http://wpt.live/html/semantics/document-metadata/the-base-element/base-javascript.html and http://wpt.live/html/semantics/document-metadata/the-base-element/base-data.html
Note that the dynamic case of using JavaScript to add a new base element is not yet supported by our browsers - this is the third test in the above tests (currently failing). This PR only applies to the HTML base element.
Associated docs: mdn/content#28865