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note:In a conforming document, the absence of the alt attribute indicates that the image is a key part of the content but that a textual replacement for the image was not available when the image was generated. source: http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html#the-img-element only case where image without alt is conforming is If the image is a descendant of a figure element that has a child figcaption element and the figcaption contains text.
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-v3.html Status: rejected Change Description: removed title attribute related text as it was incorrect https://github.com/w3c/html/commit/96b657d7432045afd7c982b7a6fc4dd93bd2c3d6 Rationale: contradicted other parts of spec.