Test the boundaries of specialized HTML elements before using them in a production interface.
Review the lessons
- HTML doctype: keep the browser in standards mode
- HTML bdi: isolate an unknown text direction
- HTML date and time inputs: separate display from submitted values
- HTML image maps: keep image hotspots accessible and stable
- HTML MathML: keep mathematical meaning in the document
- HTML form-associated custom elements: join the form contract deliberately
Common Mistakes
A browser control does not supply missing server policy or content verification.