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https://issues.apache.org/jira/browse/TIKA-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027438#comment-13027438
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Nick Burch commented on TIKA-650:
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Not sure what we should be putting into the alt attribute - word documents for
example don't have alt text for their images so we don't have any useful
information to populate the attribute with
> Missing required alt attribute on img tag
> -----------------------------------------
>
> Key: TIKA-650
> URL: https://issues.apache.org/jira/browse/TIKA-650
> Project: Tika
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.9
> Reporter: Raimund Merkert
>
> I've written a content handler that prints out the xhtml tags for conversion
> from a word document with embedded images. For images, it does not generate
> the "alt" attribute for img tags, which causes validation to fail. alt is a
> required attribute in XHTML.
> Here's a partial output from [http://validator.w3.org/check]:
> {quote}
> Error Line 3, Column 1026: required attribute "alt" not specified
> ...meta><title> </title></head><body><p><img
> src="embedded:image63.jpg"></img></p>
> ✉
> The attribute given above is required for an element that you've used, but
> you have omitted it. For instance, in most HTML and XHTML document types the
> "type" attribute is required on the "script" element and the "alt" attribute
> is required for the "img" element.
> Typical values for type are type="text/css" for <style> and
> type="text/javascript" for <script>.
> {quote}
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