At the turn of the century, Mozilla are trying to ship a web browser (also to be called Mozilla) based on the work they've got from Netscape. They shipped a series of "M" numbered (ie milestone) releases, which preview what we today think about as normal dynamic HTML but at the time it commonly just crashes the entire browser.
Like, a colleague was working on code that would reach into the DOM and just tweak the CSS for a bunch of items, delete other items, move things around, and maybe 40% of the time it would work as intended, and 60% of the time, boom, dead browser, segmentation fault.
React, where it's just normal for Javascript to rewrite the entire page in response to a keystroke, would have been completely unthinkable, there's no chance you could fill out an entire form before the browser crashed if you do that.
Like, a colleague was working on code that would reach into the DOM and just tweak the CSS for a bunch of items, delete other items, move things around, and maybe 40% of the time it would work as intended, and 60% of the time, boom, dead browser, segmentation fault.
React, where it's just normal for Javascript to rewrite the entire page in response to a keystroke, would have been completely unthinkable, there's no chance you could fill out an entire form before the browser crashed if you do that.