When linking an image, the word in square brackets is the alternative text (alt-text for short). This gets displayed if the browser can't show the image, but also gets used by screen reading software to describe the image being presented.

Please be sure to include meaningful alt text for screen-reading software

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Saying "A screenshot showing the problem" or "a picture of the skill tree" does let them know what they're missing, but doesn't actually impart any of the knowledge that seeing the picture would to really help them understand the question or answer. What kind of text is considered "meaningful" in such cases? In terms of an edit effort, is there value in adding a description that at best just let them knows what type of thing they aren't seeing, or is it only valuable in the cases where text can give the same information that the image gives? –  Sterno Aug 2 '13 at 12:10
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Seems to me that this will just needlessly bump old questions. –  user9983 Aug 2 '13 at 13:52
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"Needlessly" is a matter of opinion. Besides, what horrible thing happens if old questions are bumped? –  Brythan Aug 2 '13 at 16:04
    
Well, the front page is now flooded with old diablo questions >.> –  shanodin Aug 2 '13 at 17:10
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@shanodin This might be better in its own meta question (Should we edit old questions to improve them? Or does it make the front page less useful?). It doesn't relate much to the original poster's suggestion that people do this going forward. My own opinion is that we shouldn't be scared of new activity. Late answers and edits can improve the site. After all, there still people playing Diablo 3 -- I'm one of them. Anyway, I think that discussion better fits its own question than to attempt to chat it out here. Especially since rejected edits don't give feedback. –  Brythan Aug 2 '13 at 17:44
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I made a meta question for that discussion. –  Brythan Aug 2 '13 at 18:39
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3 Answers

For ease of editing, here's a list of posts with the default image alt text in them ordered by score: http://data.stackexchange.com/gaming/query/127084/posts-with-default-alt-text

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This won't work for my posts because I do ![](http://google.com) (leaving it blank) –  Jeffrey Lin Aug 2 '13 at 17:47
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@jeffreylin_ A blank alt-text is actually more correct than one that says, "enter image description here". If we are going to fix these questions, perhaps we should start with those that are the most wrong. –  Brythan Aug 2 '13 at 18:43
    
Then maybe we should change it so that it has no text in it by default. –  Jeffrey Lin Aug 3 '13 at 1:21
    
@jeffreylin_ - It seems someone beat you to the punch about two years ago, see this discussion on Meta.SO –  Robotnik Aug 3 '13 at 5:45
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Further to Private Pansy's answer, I've written a short query that lists your own posts that contain images, so you can check your own posts and make sure that yours have appropriate alt-text

My Posts Containing Images

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Is it possible to show only posts with the alt text? –  Jeffrey Lin Aug 3 '13 at 11:42
    
@jeffreylin_ - You mean the standard alt text? Sure, just edit my query from AND Body Like '%<img% to AND Body Like '%enter image description here%. I made it use the img tag, as I wanted to check ALL my images, to make sure the descriptions matched the image –  Robotnik Aug 3 '13 at 12:36
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One thing people should note while creating Alt Text:

Alt text should be SHORT. 50 characters is considered fairly ideal, 100 is pushing it, and 125 is generally considered a hard limit, due to some screen-reader software cutting longer texts up as if they were separate images, which is often confusing. I had tried to reject the edit from the queue with a proper explanation, but it got approved while I was writing that up.

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Care to provide a link to the question? I'm interested in what took up 125 characters :) –  Robotnik Aug 7 '13 at 3:50
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It looks to be this one. I was going to suggest switching to HTML5, but that seems to still use alt text. I'd thought they were planning on switching to embedded text, e.g. <img>Arbitrary HTML here</img>, where it would fail over gracefully if images were not supported. –  Brythan Aug 7 '13 at 4:24
    
I redid the edit with shorter alt-text. Billy, you might want to answer Sterno's question in the comment above. Time to update my meta.SO suggestion with a new feedback: rollback. –  Brythan Aug 7 '13 at 4:43
    
Incidentally, until they fix the interface, posting a meta question is probably a better way to reach an editor than supplying a rejection message. It's moderately difficult to view a rejection message. In fact, it's hard to tell that an edit was rejected unless you are paying close attention. You have to click on the Suggested Edit link and actively look for the result. –  Brythan Aug 7 '13 at 4:53
    
@Brythan and BillyMailman: Editors of a post get notified in their inbox if you @tag their username on a comment on the same post. –  galacticninja Aug 7 '13 at 4:54
    
@Brythan and BillyMailman: Here's the MSO post that discusses that: How do comment @ replies work? –  galacticninja Aug 8 '13 at 12:24
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