[3.9] gh-135661: Fix parsing start and end tags in HTMLParser according to the HTML5 standard (GH-135930) (GH-136268) #136293
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…according to the HTML5 standard (pythonGH-135930) (pythonGH-136268) * Whitespaces no longer accepted between `</` and the tag name. E.g. `</ script>` does not end the script section. * Vertical tabulation (`\v`) and non-ASCII whitespaces no longer recognized as whitespaces. The only whitespaces are `\t\n\r\f `. * Null character (U+0000) no longer ends the tag name. * Attributes and slashes after the tag name in end tags are now ignored, instead of terminating after the first `>` in quoted attribute value. E.g. `</script/foo=">"/>`. * Multiple slashes and whitespaces between the last attribute and closing `>` are now ignored in both start and end tags. E.g. `<a foo=bar/ //>`. * Multiple `=` between attribute name and value are no longer collapsed. E.g. `<a foo==bar>` produces attribute "foo" with value "=bar". * Whitespaces between the `=` separator and attribute name or value are no longer ignored. E.g. `<a foo =bar>` produces two attributes "foo" and "=bar", both with value None; `<a foo= bar>` produces two attributes: "foo" with value "" and "bar" with value None. * Fix data loss after unclosed script or style tag (pythongh-86155). Also backport test.support.subTests() (pythongh-135120). --------- (cherry picked from commit 0243f97) (cherry picked from commit c555f88) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com> Co-authored-by: Waylan Limberg <waylan.limberg@icloud.com>
ezio-melotti
approved these changes
Jul 4, 2025
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Whitespaces no longer accepted between
</and the tag name.E.g.
</ script>does not end the script section.Vertical tabulation (
\v) and non-ASCII whitespaces no longer recognizedas whitespaces. The only whitespaces are
\t\n\r\f.Null character (U+0000) no longer ends the tag name.
Attributes and slashes after the tag name in end tags are now ignored,
instead of terminating after the first
>in quoted attribute value.E.g.
</script/foo=">"/>.Multiple slashes and whitespaces between the last attribute and closing
>are now ignored in both start and end tags. E.g.
<a foo=bar/ //>.Multiple
=between attribute name and value are no longer collapsed.E.g.
<a foo==bar>produces attribute "foo" with value "=bar".Whitespaces between the
=separator and attribute name or value are nolonger ignored. E.g.
<a foo =bar>produces two attributes "foo" and"=bar", both with value None;
<a foo= bar>produces two attributes:"foo" with value "" and "bar" with value None.
Fix data loss after unclosed script or style tag (htmlparser unclosed script tag causes data loss #86155).
Also backport test.support.subTests() (gh-135120).
(cherry picked from commit 0243f97)
(cherry picked from commit c555f88)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: Ezio Melotti ezio.melotti@gmail.com
Co-authored-by: Waylan Limberg waylan.limberg@icloud.com