You can add any number of extensions to provide that. In a stock Edge browser window, I just highlighted a section of a web page, right clicked, and chose "Inspect",and it showed me the selected area in the web page source, nicely highlighted in the context of the whole source. If you don't know the capabilities of the other browsers, you can't make accurate comparisons.
I do know what that does in Chrome and FF for me, which is only showing one line out of all that I select. If I do as instructed here by LonM (Vivalid mod May 27, 2018, 2:19 PMin response to a request for the same ,
In fact, if you right-click and choose "inspect" it'll take you there right away. You can then right click whatever parent element contains your selection and copy the outerHTML It's a roundabout way of doing it, but that might help. versus View selection source.
then all I get is one line. If that worked as you said then why would there by "any number of extensions to provide that?" I have not found one. Just an extension source viewer to inspect browser extensions. Don't be claiming the capabilities of a browsers unless you can document it.
As said, in totality none can even match the functionality that Tab Mix Plus provided ( PC World said that "With Tab Mix Plus, Firefox tabs go past the obvious and into the indispensable... it's hard to imagine how you lived without it.") along with Colorful Tabs. Show me the Chrome extension than enables multiple tab rows, or adjusts max or min tab width, or even a simple option like enabling Ctrl+Tab to toggle btwn more recently opened tabs [Vivaldi shows this can be done natively], rather than the ridiculous through all tabs (there is an extension that is sppsd to do this but apparently it does not do that, but sets up alternative keys, and I have not figured it out yet). Or adds Copy Url on the right click menu for a inactive tab. Or that keeps the Find bar open across all tabs, Or any of the other functions I listed (and there are more), with the possible exception of the Open With extension I found. So far there have been zero