===GUI===
Go to Menu ''Database'' → ''New'' and select "HTML" in the input format combo box.
There's an info in the "Parsing" tab about whether tagsoup is available or not.
===Command Line===
Turn on the HTML Parser before parsing documents, and set a file filter:
SET [[Options#PARSER|PARSER]] html
SET [[Options#CREATEFILTER|CREATEFILTER]] *.html
===XQuery===