Remove author-provided from The author-provided datalist imposes a lot of complexity, and now that we aren't requiring it for HTML parser changes, it doesn't provide any additional capabilities. This patch also makes the UA popover actually have the popover attribute and makes it a instead of a . No code or concepts have "datalist" in them anymore except ::select-fallback-datalist because that is likely to get a different standards-approved name soon. This was discussed here: https://github.com/openui/open-ui/issues/1082 This patch also moves a bunch of tests from external/wpt to wpt_internal because we aren't allowed to use test_driver in reftests in external/wpt, and I was using datalist.showPicker() in a bunch of reftests which we can't do anymore because the popover is now a pseudo-element which can only be opened via select.showPicker() which requires user activation, and in order to get user activation, we have to run test_driver.bless(). Change-Id: Ib8230bc5eec214f09147ae806490df729f1e4412 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5801649 Commit-Queue: Joey Arhar jarhar@chromium.org Reviewed-by: David Baron dbaron@chromium.org Cr-Commit-Position: refs/heads/main@{#1348235}