Platform/HTML5 parser tasks

This page outlines what needs to be done to 1) enable the HTML5 parser by default on mozilla-central and 2) ship a release with the HTML5 parser enabled by default.

The HTML5 parser has been suitable for dogfooding for over a year and in the past couple of months there have been virtually no new site compat bugs. Thus, the parser is already alpha quality from a user POV but not from a zero test suite regressions POV.

Things that need to be done before turning the HTML5 parser on by default

• Get reviews on pending patches. (various people)
• Make tp4 not regress. (hsivonen)
  • Potential fix in hand.
  • The fix interacts badly with speculative parsing on test cases that use sync XHR to control the test server.
  • Tuning requires try server cycles and could, therefore, take a few days.
• Drive testsuite failures to zero. (hsivonen but help would be useful)
  • 534458 test failure on css3.info selectors test with :checked{}
    • Waiting on lazy frame construction from Timothy Nikkel. (Seems reviewed and waiting landing.)
  • 536097 spinning in nsHtml5TreeBuilder::startTag()?
    • This will either be simple or so rare that it's not an alpha blocker after all.
  • 541040 Browser freezes in the v8 test suite
    • The test suite is faulty and should be fixed in any case. However, the tp4 fix will hide this problem.
  • 541078 contentEditable reload: docshell/test/navigation/test_bug430624.html fails
    • Needs debugging.
  • 543726 dom/tests/mochitest/ajax/offline/test_foreign.html fails
    • honzab has a fix. Waiting for review.
  • 545661 browser_410196_paste_into_tags.js fails
    • Could be solved by the tp4 patch.
  • 545662 browser_bookmarksProperties.js times out
  • 545663 browser_522545.js fails
    • Could be solved by the tp4 patch.
  • 545664 browser_423515.js fails
    • Could be solved by the tp4 patch.
  • 546381 browser_bug537449.js throws and times out
    • Could be solved by the tp4 patch.
  • 546636 [Editor] layout/generic/test/test_backspace_delete.xul fails
    • If not dupe of bug 541078, probably needs help from the author of the test case.
  • 546641 [Spec] layout/style/test/test_parse_rule.html fails
    • Well understood and simple to fix.
  • 547674 [Random?] content/xul/templates/tests/test_bug441785.xul fails
    • Not understood.
  • 547688 toolkit/content/tests/widgets/test_radio.xul fails
  • 547933 test_bug451286.xul times out
  • 547934 toolkit/content/tests/widgets/test_tooltip.xul times out
  • 546648 toolkit/content/tests/widgets/test_mousecapture.xul fails
    • Should be relatively simple to debug.
• Update the html5lib test suite snapshot used by mochitest. (jgriffin)
• Review the unreviewed parser core code. (sicking?)
• Create a "slow tp" test suite for exercising speculative parsing. (bnewman) What if this suite reveals something bad?
• Security review.

Things that need to happen before shipping the HTML5 parser in a final Firefox release

• Fix "[HTML5]" bugs marked P2. (hsivonen)