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A screen reader will default to reading out the image filename when no alt text is available. [5] [6] The alt attribute can only contain plain text (no HTML or wiki markup such as wikilinks) without line breaks. The alt text is read by screen readers before the caption, so avoid duplicating the caption.
[10] [11] The alt attribute is intended to be used for short and concise descriptions of the image. Longer descriptions can be given using the longdesc attribute, which provides more detailed information and complements but does not replace the alt attribute. [2] A screen reader such as Orca will read out the alt text in place of the image. [12]
Alternative text (or alt text) is text associated with an image that serves the same purpose and conveys the same essential information as the image. [1] In situations where the image is not available to the reader, perhaps because they have turned off images in their web browser or are using a screen reader due to a visual impairment, the alternative text ensures that no information or ...
For codes from 0 to 127, the original 7-bit ASCII standard set, most of these characters can be used without a character reference. Codes from 160 to 255 can all be created using character entity names. Only a few higher-numbered codes can be created using entity names, but all can be created by decimal number character reference.
If the alt parameter is specified in the Image tag, that's what appears as the ALT text in the HTML, as you can verify by clicking on "View HTML source" in your browser. If the alt parameter is not specified in the Image tag, the HTML alt text is the empty string by default. This is new behavior for the Image and math tags.
Zero or more of these options may be specified to control the alt text, link title, and caption for the image. Captions may contain embedded wiki markup, such as links or formatting. See Wikipedia:Captions for discussion of appropriate caption text. See Wikipedia:Alternative text for images for discussion of appropriate alt text. Internet ...
The code alt="" with two quotes produces an alt text with two quotes. The code "alt=" (without the quotes) is exactly the same as not specifying the alt text at all. The problem is that alt text is needed when an image contains a link, but some images don't really need alt text because the captions are informative enough.
Under Windows, the Alt key is pressed and held down while a decimal character code is entered on the numeric keypad; the Alt key is then released and the character appears. The numerical code corresponds to the character’s code point in the Windows 1252 code page , with a leading zero; for example, an en dash (–) is entered using Alt + 0150 .