`MessagePort`

Interface defined in HTML (spec). Inherits from EventTarget; inherited members are listed on those pages.

MessagePort per engine
Engine	Interface	Members present
warpdom0.1.6maintainer's engine	Missing	0% (0 of 5)Interface not defined.
happy-dom21.0.3	Present	60% (3 of 5)Missing: `onmessage`, `onmessageerror`
jsdom30.1.3	Missing	0% (0 of 5)Interface not defined.
linkedom0.18.13	Node.js	100% (5 of 5)None missing.

An interface can be present while some of its members are missing; the table lists them per engine. Existence only: “present” means the name is defined where Web IDL puts it (the prototype, the interface object for constants and static members, or the window itself for Window), not that it behaves as the standard says.

HTML5 members

MessagePort members from HTML
Member	warpdommaintainer's engine	happy-dom	jsdom	linkedom
`postMessage`method	warpdom: no	happy-dom: yes	jsdom: no	linkedom: yes
`start`method	warpdom: no	happy-dom: yes	jsdom: no	linkedom: yes
`close`method	warpdom: no	happy-dom: yes	jsdom: no	linkedom: yes
`onmessage`attribute	warpdom: no	happy-dom: no	jsdom: no	linkedom: yes
`onmessageerror`attribute	warpdom: no	happy-dom: no	jsdom: no	linkedom: yes

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