HTML Basic
Why should you add alternative text to your images ?

In case the user wishes to load a different picture
All of these
So the user can save the image using the text as a name
So the users can get an idea of what the image is before

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HTML Basic
Rendering engine is not responsible for

parsing style information (CSS, XSL, and so on)
generating a visual presentation of the formatted content including media files referenced
none of the mentioned
parsing the markup content (HTML)

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