fixup! Use Cell/RefCell for interior mutability of UIEvent.
fixup! Use Cell/RefCell for interior mutability of Node.
fixup! Use Cell/RefCell for interior mutability of Element.
fixup! Use Cell/RefCell for interior mutability of Attr, AttrList, Blob, BrowserContext, ClientRect, and ClientRectList.
fixup! Use Cell/RefCell for interior mutability of Attr, AttrList, Blob, BrowserContext, ClientRect, and ClientRectList.
fixup! Use Cell/RefCell for interior mutability of Attr, AttrList, Blob, BrowserContext, ClientRect, and ClientRectList.