alt Hacker NewsIn the good old days Netflix had "Dynamic HTML" code that would take a DOM element which scrolled out of view port and move it to the position where it was about to be scrolled in from the other end. Hence he number of DOM elements stayed constant no matter how far you scroll and the only thing that grows is the Y coordinate.
They did it because a lot of devices running Netflix (TVs, DVD players, etc) were underpowered and Netflix was not keen on writing separate applications. They did, however, invest into a browser engine that would have HW acceleration not just for video playback but also for moving DOM elements. Basically, sprites.
The lost art of writing efficient code...
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This is how every scrolling list has been implemented since the 80s. We actually lost knowledge about how to build UI in the move to web
> Hence he number of DOM elements stayed constant no matter how far you scroll and the only thing that grows is the Y coordinate.
This is generally called virtual scrolling, and it is not only an option in many common table libraries, but there are plenty of standalone implementations and other libraries (lists and things) that offer it. The technique certainly didn't originate with Netflix.