No HTML doctype

Low priorityTechnical

The document doesn’t start with <!doctype html>, so browsers render it in “quirks mode”.

What triggers this issue

• No doctype at the start of the HTML.

Why it matters

Quirks mode emulates 1990s browser bugs, which changes how widths, heights and fonts are calculated and can break your layout in subtle ways.

How to fix it

1. Make <!doctype html> the first line of every page.

<!doctype html>