Map mutationobserver web-feature
#56818
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Feature: `mutationobserver` Reference: https://github.com/web-platform-dx/web-features/blob/main/features/mutationobserver.yml Notable exclusions 1. CSSOM Integration Tests - `css/cssom/cssstyledeclaration-mutationrecord-*.html` - These tests verify that CSSOM operations queue mutation records. While they verify an interaction with MutationObserver, the primary focus is on the CSSOM behavior (specifying when records are queued). 2. Cross-cutting concerns - `custom-elements/*`: Custom element reactions and microtasks. - `shadow-dom/*`: Shadow DOM slot changes and declarative shadow DOM. - `trusted-types/*`: Trusted Types assignment. - `web-animations/*`: Animation commitStyles. - `webdriver/*`: WebDriver BiDi tests. - `html/webappapis/*`: Microtask queuing and execution order. Notable inclusions 1. `css/cssom/MutationObserver-style.html` - Explicitly tests "Observer notifications when updating styles", which is testing the observer's ability to observe style attribute mutations.
jdm
approved these changes
Dec 18, 2025
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Feature:
mutationobserverReference: https://github.com/web-platform-dx/web-features/blob/main/features/mutationobserver.yml
Notable exclusions
CSSOM Integration Tests
css/cssom/cssstyledeclaration-mutationrecord-*.htmlCross-cutting concerns
custom-elements/*: Custom element reactions and microtasks.shadow-dom/*: Shadow DOM slot changes and declarative shadow DOM.trusted-types/*: Trusted Types assignment.web-animations/*: Animation commitStyles.webdriver/*: WebDriver BiDi tests.html/webappapis/*: Microtask queuing and execution order.Notable inclusions
css/cssom/MutationObserver-style.html