Header column spanning more columns than expected

In https://doc.qt.io/qt-6/highdpi.html, the table with the title "X11 DPI Configuration Priority" has an attribute colspan="3" whereas the table only has two columns:

{{

<table class="generic"> <thead><tr class="qt-style"><th colspan="3">X11 DPI Configuration Priority</th></tr> <tr class="qt-style"><th>Property</th><th>Notes</th></tr></thead> <tr class="odd" valign="top"><td>1. Xft/DPI</td><td>From X settings. Global logical DPI value.</td></tr>

}}

The first row should look like <th colspan="3">. The error propagates in all output formats.