Joe McGill 788bb093f2 Media: Remove alt fallbacks to improve accessibility.
This removes the fallbacks in `wp_get_attachment_image()` and in
`wp.media.string.props` which attempt to generate an `alt` value
from the image caption or title if an `alt` attribute isn't explicitly
set.

This allows for image HTML to be generated that contains an empty `alt`
value, i.e., `alt=""` which is much preferable for screen readers than
reading redundant content in the case of a caption, or when reading the
image title, which is often generated from the filename and not helpful
as `alt` text.

Props odie2, joedolson, rianrietveld, afercia, iamjolly, joemcgill.
Fixes #34635.

git-svn-id: https://develop.svn.wordpress.org/trunk@38812 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-19 03:05:51 +00:00
2016-09-06 18:12:09 +00:00
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