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The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text (alt text) that is to be displayed in place of an element that cannot be rendered. The alt attribute is used for short descriptions, with longer descriptions using the longdesc attribute .
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.
On a computer running the Microsoft Windows operating system, many special characters that have decimal equivalent codepoint numbers below 256 can be typed in by using the keyboard's Alt+decimal equivalent code numbers keys. For example, the character é (Small e with acute accent, HTML entity code é) can be obtained by pressing Alt+1 3 0.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
In HTML and XML, a numeric character reference refers to a character by its Universal Coded Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
Otherwise, (if the image type is unspecified or is "frameless"), this text is used for the link title provided the link has not been suppressed with "|link=", and also for the alt text provided an explicit alt=Alt has not been supplied. The actual alt text for the displayed image will be one of the following, in order of preference:
In the first example, without an LRM control character, a web browser will render the ++ on the left of the "C" because the browser recognizes that the paragraph is in a right-to-left text and applies punctuation, which is neutral as to its direction, according to the direction of the adjacent text. The LRM control character causes the ...
The base image has alt text "1896 Democratic campaign poster". The left circle has alt text "William J. Bryan". The right circle has alt text "Arthur Sewall". The blue (i) has alt text "About this image". All these are repeated as link title text, which provides a tooltip in some browsers, with the exception of the base image, which has link ...