LeaVerou/style-observer

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Run JS when a CSS property changes. Any CSS property.

Stars: 542
Forks: 11
Open beginner issues: 0
Indexed issues: 13

Dominant language: JavaScript
License: MIT
Last GitHub push: Dec 4, 2025
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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13 open issues indexed

Unexpected behavior and potential memory leaks when calling unobserve() Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

LeaVerou/style-observer#142 · Opened Jun 4, 2026
Support option to move `--style-observer-transition` property to be defined under a class instead of inlined Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

LeaVerou/style-observer#141 · 2 comments · Opened Mar 18, 2026
`RenderedObserver` does not work with `display: contents` element Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

LeaVerou/style-observer#140 · Opened Feb 10, 2026
The `StyleObserver` constructor doesn't accept single values as the values of the `properties` and `targets` options Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

LeaVerou/style-observer#136 · 2 comments · Opened Jul 19, 2025
Perf optimization: Allow passing a property definition Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/style-observer#134 · 2 reactions · Opened Jun 9, 2025
Document that any custom property being observed must had been set before observer Open

bug

LeaVerou/style-observer#133 · 9 comments · 1 assignee · Opened Jun 7, 2025
High performance option (`oldValues`?) Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

LeaVerou/style-observer#126 · Opened Jun 1, 2025
Generalize the shadow host handling via a `selector` option? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

LeaVerou/style-observer#125 · Opened Jun 1, 2025
Existing transition is overwritten in Firefox when there is more than one `transition-property` Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

LeaVerou/style-observer#113 · 3 comments · Opened May 19, 2025
Provide method third-party scripts can call which check which properties have changed and fires the callback if any Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

LeaVerou/style-observer#88 · Opened Feb 21, 2025
An idea for how we can observe changes caused due to animations Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/style-observer#87 · 2 comments · Opened Feb 21, 2025
Implement `immediate` option Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

LeaVerou/style-observer#45 · 1 reaction · Opened Feb 5, 2025
Undocumented browser bugs Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

LeaVerou/style-observer#42 · 3 comments · Opened Feb 4, 2025

LeaVerou/style-observer

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