Add more tests for IndexedDB exception

 - rewrite the valid checkpoints from #292
Add more tests for IDBIndex get
Fix open issues
Remove 'oncomplete callback'
button, span, table, verification (including manipulation) test pages
SVG test page with complete button
Tests for cross-origin object behavior. v2
Pull out document.domain tests into a separate window. v1
Test pages for test assertions 4.3 and 5.3
Addressed Ms2ger's review comments.
Update pointerevent_pointerenter_nohover-manual.html
Update pointerevent_pointerout_after_pointerup_nohover.html
Update pointerevent_pointerout_after_pointerup_nohover.html

Added attribute checking.
Merge branch 'svgc' of https://github.com/ArtemAntonets/web-platform-tests-msft into submission/Microsoft/PointerEvents2
Update pointerevent_pointerout_after_pointercancel_touch.html

Added attribute checking.
Update pointerevent_pointerout_after_pointercancel_touch.html

Clean up.
Create pointerevent_pointerleave_after_pointercancel_touch.html
Create pointerevent_pointerleave_after_pointerup_nohover.html
Update pointerevent_pointerleave_after_pointercancel_touch.html

Replace assert_true(false,...) with assert_unreached(...).
Update pointerevent_pointerleave_after_pointerup_nohover.html

Replace assert_true(false,...) with assert_unreached(...).