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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 .
For example, the alt attribute on an institution's logo should convey that it is the institution's logo instead of describing details of what the logo looks like. [3] [4] On Wikipedia, alt text is provided in the alt parameter in the MediaWiki markup. Many templates, like {}, have parameters for specifying alt text. For images that link to ...
In keeping with other Internet guidelines, the term "alt text" (in a code font) is used here to refer to the text supplied for the image alt parameter and which generates text for the HTML alt attribute; the term "alternative text" refers to the text equivalent for an image, regardless of where that text resides.
The new Alt+0### combination (which prefixes a zero to each Alt code), produces characters from the newer "Windows code pages." [ a ] For example, Alt + 0 1 6 3 yields the character £ (symbol for the pound sterling ) which is at 163 in CP1252.
This guideline includes alt text for LaTeX-formatted equations in <math> mode. See Wikipedia:Manual of Style/Mathematics § Alt text. Do not insert images in headings; this includes icons and <math> markup. Doing so can break links to sections and cause other problems.
The explicitly requested Alt, if any; The explicitly requested Caption, if the image type has no visible caption; The empty string, if there is an explicitly requested Caption and the image type has a visible caption. The image file name if there is no explicitly requested Alt or Caption. This is never a satisfactory option.
This page lists codes for keyboard characters, the computer code values for common characters, such as the Unicode or HTML entity codes (see below: Table of HTML values"). There are also key chord combinations, such as keying an en dash ('–') by holding ALT+0150 on the numeric keypad of MS Windows computers.
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.