Just to add to the task description, which is already pointing into a good direction. A good overview on the accessible use of emojis can be found in Ashley Sheridan's article. Two things should be amended:

$( '#mw-userfeedback-form' ).append( '<a id="mw-userfeedback-thumbs-up"' +
    ' class="thumbs thumbs-up"><span role="img" aria-label="Thumbs up">👍</span></a>' );
$( '#mw-userfeedback-form' ).append( '<a id="mw-userfeedback-thumbs-down"' +
    'class="thumbs thumbs-down"><span role="img" aria-label="Thumbs down">👎</span></a>' );

• An element with an inherent role shouldn't be overridden with another role. In this case the anchor already carries link and the role="img should be provided to a span within wrapping the actual emoji. With this, the screen reader exposes it as a link carrying an image which reads “Thumbs up” or “Thumbs down”
• “Yes” or “No” didn't seem sufficient to me without having all the context of the gadget. The aria-label should be short, but descriptive.

@Aklapper @Volker_E Thanks for pointing that! Article was a good one :)

@Quiddity Could you help update the code in my gadget on Wikitech: https://wikitech.wikimedia.org/wiki/MediaWiki:Gadget-userfeedback.js with:

In T225226#5244316, @Volker_E wrote:

$( '#mw-userfeedback-form' ).append( '<a id="mw-userfeedback-thumbs-up"' +
    ' class="thumbs thumbs-up"><span role="img" aria-label="Thumbs up">👍</span></a>' );
$( '#mw-userfeedback-form' ).append( '<a id="mw-userfeedback-thumbs-down"' +
    'class="thumbs thumbs-down"><span role="img" aria-label="Thumbs down">👎</span></a>' );

In T225226#5252101, @srishakatux wrote:

@Quiddity Could you help update the code in my gadget on Wikitech

Nope! You need an Interface Admin to edit any .js/.css files in that namespace. :-)

In T225226#5252152, @Quiddity wrote:

In T225226#5252101, @srishakatux wrote:

@Quiddity Could you help update the code in my gadget on Wikitech

Nope! You need an Interface Admin to edit any .js/.css files in that namespace. :-)

:(

@bd808 @Krinkle Could one of you help? :)

In T225226#5252154, @srishakatux wrote:

@bd808 @Krinkle Could one of you help? :)

{{done}} -- https://wikitech.wikimedia.org/w/index.php?title=MediaWiki:Gadget-userfeedback.js&diff=1829066&oldid=1817597