HTML and CSS Reference
In-Depth Information
automated treatment, to change the contents' display characteristics
( class , style ), to reference the language ( lang ) used, and to specify the
direction in which the text should flow ( dir ). And, of course, there are all
the user events that may happen in and around the tagged contents that
the browser senses and that you may react to via an on-event attrib-
ute and some programming. [ Inline Styles: The style Attribute, 8.1.1 ]
[ Style Classes, 8.3 ]
Of these many HTML 4 and XHTML attributes, id is the most important.
It lets you label the image for later access by a program or browser op-
eration (see Chapter 12 ). [ The id attribute, ]
The remaining attributes have questionable meaning in context with
<img> . Granted, a few stylesheet options are available that may influence
an image's display, and it's good to include a title (although alt is bet-
ter). However, it's hard to imagine the influence that language ( lang ) or
its presentation direction ( dir ) might have on an image. [ The dir attrib-
ute, ] [ The lang attribute, ] The name, onAbort, onError, onLoad, and other event
There are four <img> attributes originally supported by Netscape and
now by all the popular browsers that enable you to use JavaScript to
manipulate images. The first is the name attribute. [*] Now redundant with
the id attribute, name lets you label the image so that a JavaScript applet
can reference it. For example:
[*] HTML version 4.01 and XHTML have adopted the name attribute, too.
<img src="pics/kumquat.gif" name="kumquat">
lets you later refer to that picture of a kumquat as simply "kumquat" in
a JavaScript applet, perhaps to erase or otherwise modify it. You cannot
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