[3.11] gh-135661: Fix parsing start and end tags in HTMLParser according to the HTML5 standard (GH-135930) (GH-136268) by miss-islington · Pull Request #136291 · python/cpython (original) (raw)

…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

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