ExampleGroup related options with <optgroup> tags: | Browser Support |
1. Definition and Usage
The <optgroup> is used to group related options in a drop-down list.
If you have a long list of options, groups of related options are easier to handle for a user.
2. Differences Between HTML and XHTML
None
3. Required Attributes
DTD indicates in which HTML 4.01/XHTML 1.0 DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
Attribute | Value | Description | DTD |
---|---|---|---|
label | text | Specifies a label for an option-group | STF |
4. Optional Attributes
Attribute | Value | Description | DTD |
---|---|---|---|
disabled | disabled | Specifies that an option-group should be disabled | STF |
5. Standard Attributes
The <optgroup> tag supports the following standard attributes:
Attribute | Value | Description | DTD |
---|---|---|---|
class | classname | Specifies a classname for an element | STF |
dir | rtl ltr | Specifies the text direction for the content in an element | STF |
id | id | Specifies a unique id for an element | STF |
lang | language_code | Specifies a language code for the content in an element | STF |
style | style_definition | Specifies an inline style for an element | STF |
title | text | Specifies extra information about an element | STF |
xml:lang | language_code | Specifies a language code for the content in an element, in XHTML documents | STF |
6. Event Attributes
The <optgroup> tag supports the following event attributes:
Attribute | Value | Description | DTD |
---|---|---|---|
onclick | script | Script to be run on a mouse click | STF |
ondblclick | script | Script to be run on a mouse double-click | STF |
onmousedown | script | Script to be run when mouse button is pressed | STF |
onmousemove | script | Script to be run when mouse pointer moves | STF |
onmouseout | script | Script to be run when mouse pointer moves out of an element | STF |
onmouseover | script | Script to be run when mouse pointer moves over an element | STF |
onmouseup | script | Script to be run when mouse button is released | STF |
onkeydown | script | Script to be run when a key is pressed | STF |
onkeypress | script | Script to be run when a key is pressed and released | STF |
onkeyup | script | Script to be run when a key is released | STF |