Tricks like crafting css that only some browsers could parse.
height/**/: 300px;
Or the insane sliding doors technique we used to get rounded corners.https://alistapart.com/article/slidingdoors/
The mystery script we included to get alpha support in images.
https://git.twinhelix.com/cgit/iepngfix/tree/iepngfix.htc
The fact that select inputs were rendered by the OS so you had to find them all and hide them when you opened a modal so they didn’t sit on top of your content.
The desire to support custom files that drive us into swapping all the text for blocks of Flash after the page loaded.
It was almost better than the 20 level deep nested table layouts full of shims we had to do.