so, the webpage is read-only, but EWW makes it writeable and enhances the reading experience,
including but not limited to Emacs package ecosystem like:
symbol-overlay-mode and highlight-regexp to highlight frequently shown words/symbols
swiper enable regexp search
narrow-to-* narrow to section
Folding by Heading section like org-mode <tab>
imenu generates menus from heading, and support jumping between them
Replace big image/video (for example occupying full-screen, and results in long page scrolling, which is bad, and easy to lose way)
with a single line of anchor link text,
and open those images locally with sxiv, video with mpv with seamless integration (enable frame-level control, stop/next/previous frame)
Text operations like deleting, formatting, alignment, sorting, collapse code sections