Automatic update from web-platform-tests domparsing: Add comments about specification issue URLs Change-Id: Ief2e4dd2ced9dff5f6f4127af80b5d9eb7641fdf Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600926 Auto-Submit: Kent Tamura <tkent@chromium.org> Reviewed-by: Yoshifumi Inoue <yosin@chromium.org> Commit-Queue: Kent Tamura <tkent@chromium.org> Cr-Commit-Position: refs/heads/master@{#658042} -- wpt-commits: 698bd5949f28ba0fe0d065a59ee7038911b5ed61 wpt-pr: 16741