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Base64 encoding/decoding methods window.atob and window.btoa should be specified. They are already supported in major engines except Trident and are convenient for working with base64 encoded data e.g. in data urls.
*** Bug 8559 has been marked as a duplicate of this bug. ***
Perhaps these should be defined at the ECMAScript level, since they are not Web-dependent.
Are they willing to spec it? If not, I'm happy to add them here.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Rejected Change Description: no spec change Rationale: This only seems to exist in Gecko and Webkit, and best belongs in the JS spec anyway, so I'm going to punt on this.