alt sources - definizione. Che cos'è alt sources
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Cosa (chi) è alt sources - definizione

ALTERNATIVE TEXT THAT APPEARS WHEN A HTML ELEMENT CANNOT BE RENDERED
ALT text; Alt Text; Alt tag; Alt text; Alt-text; Alternate text; Alt tags; Alt caption
  • An example of alt attribute text being displayed in place of an unavailable image, with the underlying HTML displayed below it
  • Lynx web browser]], displaying the text of the alt attribute in orange in place of the images

ALTS         
WIKIMEDIA DISAMBIGUATION PAGE
ALT; Alt (disambiguation); ALTs; ALT (disambiguation)
Association for Local Telecommunications Services (Reference: org., USA)
ALTS         
WIKIMEDIA DISAMBIGUATION PAGE
ALT; Alt (disambiguation); ALTs; ALT (disambiguation)
Application Layer Transport Security (ALTS) is a Google developed authentication and encryption system used for securing Remote procedure call (RPC) within Google machines. Google started its development in 2007, as a tailored modification of TLS.
alt         
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WIKIMEDIA DISAMBIGUATION PAGE
ALT; Alt (disambiguation); ALTs; ALT (disambiguation)
<character> /awlt/ 1. The alt modifier key on many keyboards, including the IBM PC. On some keyboards and operating systems, (but not the IBM PC) the alt key sets bit 7 of the character generated. See bucky bits. 2. The "clover" or "Command" key on a Macintosh; use of this term usually reveals that the speaker hacked PCs before coming to the Mac (see also feature key). Some Mac hackers, confusingly, reserve "alt" for the Option key (and it is so labelled on some Mac II keyboards). 3. (Obsolete PDP-10; often "ALT") An alternate name for the ASCII ESC character (Escape, ASCII 27), after the keycap labelling on some older terminals; also "altmode" (/awlt'mohd/). This character was almost never pronounced "escape" on an ITS system, in TECO or under TOPS-10, always alt, as in "Type alt alt to end a TECO command" or "alt-U onto the system" (for "log onto the [ITS] system"). This usage probably arose because alt is easier to say. 4. <messaging> One of the Usenet newsgroup hierarchies. It was founded by John Gilmore and Brian Reid. The alt hierarchy is special in that anyone can create new groups here without going though the normal voting proceduers, hence the regular appearence of new groups with names such as "alt.swedish.chef.bork.bork.bork". [Jargon File] (1997-04-12)

Wikipedia

Alt attribute

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. The standards organization for the World Wide Web, the World Wide Web Consortium (W3C), recommends that every image displayed through HTML have an alt attribute, though the alt attribute does not need to contain text. The lack of proper alt attributes on website images has led to several accessibility-related lawsuits.

The alt attribute is used to increase accessibility and user friendliness, including for blind internet users who rely on special software for web browsing. The use of the alt attribute for images displayed within HTML is part of W3C's Web Content Accessibility Guidelines (WCAG). Screen readers and text-based web browsers read the alt attribute in place of the image. The text within the alt attribute substitutes the image when copy-pasted as text and makes images more machine-readable, which improves search engine optimization (SEO).