I’ll engage with the editorialised title (which will probably be changed soon), “HTML is a native image format, hear me out”:
data:image/svg+xml,
<svg xmlns="http://www.w3.org/2000/svg">
<foreignObject width="100%25" height="100%25">
<div xmlns="http://www.w3.org/1999/xhtml">
Behold!
</div>
</foreignObject>
</svg>