embed { }
Embed external content.
iframe { }
Inline frame.
object { }
External object.
audio { // Make sure audio controls have a size. min-block-size: 1em; }
Embed audio.
img { }
Image.
picture { }
Picture.
video { }
Embed video.
math { }
Top-level MathML element.
svg { }
Top-level SVG element.