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If you want image display, there Emacs has it eons ago, and people write plug-ins for it, like this one: https://github.com/josteink/wsd-mode

Emacs is also a fine PDF reader. I can search text in the PDF file with highlighting and a table of content side by side. All can be controlled with the keyboard: https://tuhdo.github.io/static/emacs-read-pdf.gif. I never use Evince again.

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No, I don't want image display. I want to replicate Atom's inlining editing features. Did you look into that? This is one example: https://discuss.atom.io/t/expand-css-rules-inline-html/12437

i think skewer-mode is close enough: https://github.com/skeeto/skewer-mode for live editing.

I don't think that inlining feature really help much. Generally, if you want to access a css element in Emacs, you jump in, edit and jump back in an instant to see your result.