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Edge is actually pretty decent. Native vertical tabs, M365 SSO integration, native multiple profiles with quick switching, preinstalled on your work computer and will work with anything that “only works in chrome”
Obviously this is ignoring the obvious downsides such as assisting Microsoft’s search, browser and platform monopolies, tracking data sent to Microsoft, etc. etc.
Sounds like you’re describing pure HTML5
JavaScript partially took off due to HTML’s limited functionality at the time. This was also around the time that web media was becoming really big, which before HTML5 it wasn’t easy to integrate into a webpage without turning to extra libraries or extensions