lucy24
msg:4354340 | 9:54 pm on Aug 22, 2011 (gmt 0) |
The "longdesc" is not recognized by all browsers, so don't rely on it for essential information. It's a link to longer text, not a kind of mega-alt. w3c says
| The longdesc attribute is so poorly supported that it should not be used. |
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A lot of the tutorial is out of date but this bit is even more true today, since "longdesc" is not in html5 at all-- probably precisely because nobody was using it correctly.
"alt" is required by the validator (and by human decency, unless it's just a decoration). Any user who has images turned off for any reason, or who uses a text-reading device, will get their only information from the "alt".
"title" and "alt" should be mutually exclusive. The alt displays when the picture doesn't; the title appears when the picture is there. At one time w3c even had a blurb explaining that the reason Firefox was so odd in it treatment of alt/title is that it was the only browser that did what it was supposed to do. (Haven't checked, but I really hope this is no longer true.)
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piatkow
msg:4357037 | 9:43 am on Aug 31, 2011 (gmt 0) |
the reason Firefox was so odd in it treatment of alt/title is that it was the only browser that did what it was supposed to do. |
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It confused the **** out of me when I first tested a page in Firefox but I soon unlearned the bad habits that I had developed from using IE. Like lucy24 I haven't actually checked how the later versions of IE are behaving with this.
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phranque
msg:4357529 | 8:05 am on Sep 1, 2011 (gmt 0) |
| "alt" is required by the validator (and by human decency, unless it's just a decoration) |
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when it is a decoration with no semantic meaning, the alt attribute should be used with a null value.
this will make the image "disappear" for most text-based browsers, screen readers and other such user agents.
these w3c-recommended accessibility techniques may provide some useful guidance:
H37: Using alt attributes on img elements:
http://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/html#H37
H89: Using the title attribute to provide context-sensitive help:
http://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/html#H89
and previous WebmasterWorld discussion...
The Title Attribute:
http://www.webmasterworld.com/accessibility_usability/3597552.htm [webmasterworld.com]
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perfectionj
msg:4362281 | 7:13 am on Sep 14, 2011 (gmt 0) |
You can add description in Alt Tag of image, how long you want. But it look like spam and Search engine hate this.
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stephen011
msg:4362340 | 12:01 pm on Sep 14, 2011 (gmt 0) |
We are using alt attribute for images in a website.Search engine can't read image, so we are using alternative text for images using alt attribute.It will make your image search engine friendly.
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penders
msg:4364465 | 7:58 pm on Sep 19, 2011 (gmt 0) |
| ...the reason Firefox was so odd in it treatment of alt/title is that it was the only browser that did what it was supposed to do. (Haven't checked, but I really hope this is no longer true.) |
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As far as I'm aware, all modern browsers handle this the same now. As I recall it was IE6 and IE7 that were the anomalies (fixed in IE8), in that they would display the ALT text as a tool tip. However, if a TITLE was specified then this would take priority. The problem came when an IMG that had just an ALT attribute was included in an anchor that had a TITLE attribute. IE6 and 7 would display the ALT text of the image as a tool tip, whereas all other browsers would correctly show the TITLE text of the anchor as a tool tip.
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