HTML
The Elements Panel
The Elements panel shows the live DOM, not your file. That difference is why it is the first place to look when markup behaves in a way the source doe...
DevTools and Debugging
The Elements panel, Console, Network tab, validation and debugging forms.
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Notes
HTML
The Console and the Network Panel
The Console reports what went wrong. The Network panel shows what was requested, in what order, and how big it was. Between them they explain most pag...
HTML
Validating HTML
The validator catches nesting errors, duplicate ids and missing attributes in seconds. A page that renders is not the same as a page that is correct.
HTML
Debugging Common HTML Problems
A symptom to cause lookup for the problems that come up repeatedly, and the two minute checks that resolve most of them.