Web Platform APIs

Here is a list of web platform APIs Deno implements:

You can find documentation about this API on MDN.

• The Deno user agent does not have a cookie jar. As such, the set-cookie header on a response is not processed, or filtered from the visible response headers.
• Deno does not follow the same-origin policy, because the Deno user agent currently does not have the concept of origins, and it does not have a cookie jar. This means Deno does not need to protect against leaking authenticated data cross origin. Because of this Deno does not implement the following sections of the WHATWG specification:
  • Section 3.2. CORS protocol.
  • Section 3.5. CORB.
  • Section 3.6. 'Cross-Origin-Resource-Policy' header.
  • Atomic HTTP redirect handling.
  • The opaqueredirect response type.
• A fetch with a redirect mode of will return a basic response rather than an opaqueredirect response.

You can find documentation about this API on .

• Events do not bubble, because Deno does not have a DOM hierarchy, so there is no tree for Events to bubble/capture through.

• Blob
• Channel Messaging API
• FormData
• setTimeout, setInterval, clearInterval
• URL
• URLSearchParams
• Web Workers API

Definitions that are specific to workers can be found in the file.