<embed>
A legacy integration point for external content and plugins.
Baseline: Widely available · Media & embedded content
When to use it
Almost never in new work — historic plugin content only.
When not to
Modern replacements exist for everything it did: iframe, video, audio, img, or object for PDFs.
Key attributes
src / type- resource and MIME type
width / height
Example
<embed type='application/pdf' src='/docs/spec.pdf' width='600' height='400'>