use fast_html's fragment parsing mode

test was removed because myhtml will treat a fragment without non-broken
top level tag or children as a text node
3 jobs for master in 1 minute and 19 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #83787
analysis

00:01:18

passed #83785
lint

00:01:18

passed #83786
unit-testing

00:01:18

58.06%