Please refer to the following compatibility information: - https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove#Browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/add#Browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/remove#Browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/toggle#Browser_compatibility Finally, for the `pushState`/`replaceState` polyfills, please refer to PRs 10461 and 11318 for additional details.