docs(resize-observer): add comprehensive concept page with tests

Leonardo Maldonado committed on Jan 6, 2026, 10:02 PM

Showing 4 changed files +3158 additions -0 deletions

A docs/beyond/concepts/mutation-observer.mdx +917

A docs/beyond/concepts/resize-observer.mdx +903

A tests/beyond/observer-apis/mutation-observer/mutation-observer.dom.test.js +665

A tests/beyond/observer-apis/resize-observer/resize-observer.test.js +673