Why position: sticky “Randomly” Stops Working

Most people blame the browser.
The real reason is parent overflow context.

Problem

.sidebar {
  position: sticky;
  top: 0;
}

Works… until it doesn’t.

Hidden cause
If ANY parent has:

overflow: hidden;
overflow: auto;
overflow: scroll;

Sticky breaks.

Why
position: sticky is calculated relative to the nearest scroll container, not the viewport.

Fix

.parent {
  overflow: visible;
}

When to use sticky

When NOT

CSS: Use clamp() for Responsive Font Sizes Without Media Queries

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