In bug 1510785 I will be disabling a few textbox tests that depend on XBL. Once the elements are converted to custom elements we should no longer skip these tests.

So far the tests skipped:
textbox-multiline-default-value.xul
335628-2.xul

textbox-multiline-default-value.xul is no longer relevant after bug 1513343, it's very likely testing the wrong thing, it could be removed completely now.
335628-2.xul will need to change to test is="search-textbox", since that will be the only remaining <textbox> XUL element.

There are also a couple of reftests that will no longer be useful after bug 1513325, notably the ones testing that normal textboxes look like normal inputs:
https://searchfox.org/mozilla-central/source/editor/reftests/xul

This will be easier once search-textbox is no longer using the <textbox> tag

There are also a few tests that programatically create XUL textboxes: https://searchfox.org/mozilla-central/search?q=createXULElement(%22textbox&case=false&regexp=false&path=

Comment on attachment 9098674 [details]
Bug 1566674, Replace XUL textbox with HTML input in testcases within layout directory

Revision D48126 was moved to bug 1586336. Setting attachment 9098674 [details] to obsolete.

Comment on attachment 9098615 [details]
Bug 1566674, Replace XUL textbox with HTML input in testcases within editor directory

Revision D48100 was moved to bug 1586337. Setting attachment 9098615 [details] to obsolete.

Comment on attachment 9098674 [details]
Bug 1566674, Replace XUL textbox with HTML input in testcases within layout directory

Revision D48126 was moved to bug 1586336. Setting attachment 9098674 [details] to obsolete.