Hover text
Hover text or Alt text is the text that appears when your mouse hovers over an image.
Don't overlook the value of this text, there are a large number of website users with sight limitations who rely on screen readers to read aloud the text that appears on the website. Whether an image is integral to your text or just extra information take a few moments to describe it concisely.
Whether you are identifying club members, the 2009 beer festival or a Peace rose:
It's worth bearing in mind that Google and the other search engines are effectively blind, so the description helps them improve the indexing of information on your page.
Adding hover / Alt text
There are two opportunities to add this text:
As you add a new image
Select the image using Browse, as you place the image 
on the page, a box will appear asking you to Type a little text to help partially sighted readers, this is the moment to add the descriptive text. As you will see if you point at the icon earlier in this paragraph I described the icon as Place image icon.
Editing hover / Alt text
Select the image by pointing your cursor and clicking, now click on the place image icon a box will appear asking you to Type a little text to help partially sighted readers, you can now add text or edit the current text.
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