/ Web development
Problem IMG tag, ALT attribute in FireFox
It was something that I had never pay attention to... I do not use much the ALT attribute of IMG tag. Most of the cases I used to leave it empty. I believed that it's purpose was to give an description, tooltip ot the image. But this is wrong!
The real purpose of "ALT" defined by the World Wide Web Consortium is:
For user agents that cannot display images, forms, or applets, this attribute specifies alternate text. The alt attribute must be specified for the IMG and AREA elements. It is optional for the INPUT and APPLET elements.
- Do not specify irrelevant alternate text when including images intended to format a page, for instance, alt="red ball" would be inappropriate for an image that adds a red ball for decorating a heading or paragraph. In such cases, the alternate text should be the empty string (""). Authors are in any case advised to avoid using images to format pages; style sheets should be used instead.
- Do not specify meaningless alternate text (e.g., "dummy text"). Not only will this frustrate users, it will slow down user agents that must convert text to speech or braille output.
For a description (tooltip) of an image you have to use the HTML standard attribute title="whatever".
Every HTML tag has own specific attributes, but and Standard Attributes (for all tags with a few exceptions).
Not valid in base, head, html, meta, param, script, style, and title elements.
| Attribute | Value | Description |
|---|---|---|
| class | class_rule or style_rule | The class of the element |
| id | id_name | A unique id for the element |
| style | style_definition | An inline style definition |
| title | tooltip_text | A text to display in a tool tip |
Language Attributes
Not valid in base, br, frame, frameset, hr, iframe, param, and script elements.
| Attribute | Value | Description |
|---|---|---|
| dir | ltr | rtl | Sets the text direction |
| lang | language_code | Sets the language code |
Keyboard Attributes
| Attribute | Value | Description |
|---|---|---|
| accesskey | character | Sets a keyboard shortcut to access an element |
| tabindex | number | Sets the tab order of an element |
visit: www.w3schools.com/tags/ref_standardattributes.asp
category: Web development, posted date: 31.05.2006, Comment
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