Debugging a Full-Viewport HTML Dialog Modal

The author encountered a height issue while using the HTML `` element to create a side panel: a gap appeared at the bottom, preventing it from taking up the full screen height. The debugging process involved various methods, including consulting AI tools like Claude and ChatGPT. The culprit was a default Chrome style applied to the `` element: `max-height: calc(100% - 2em - 6px);`. Adding `max-height: inherit` or `max-height: 100vh` resolved the problem. Further investigation into the HTML specification revealed this default style was added to fix a previous bug, highlighting the ever-evolving nature of web standards.
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