HTML <command/> Tag

 

Wednesday, August 13, 2014

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The <command/> Tag in HTML 5

The <command> tag is one of the tags for interactive content in HTML.

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<command/> Tag Syntax

Rules for coding HTML command/ elements
<command .../>

<command/> Content Model

Contents of the command element

Content: Empty. All properties are coded using attributes.

Since the <command/> tag is a void element, it is not allowed to have any content, even HTML comments and therefore should always be coded as a self-closing standalone tag, ending with the delimiters /> rather than just > (<command .../>).

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<command/> Tag Attributes

Attributes of the <command/> tag
global attributes In addition to the personal attributes of the <command> tag below, any of the common HTML attributes can also be coded.
checked="checked"
disabled="disabled"
icon

a URI reference that resolves to the URL of a small two-dimensional image resource

Use percent escape codes as explained in the URL-encoding tutorial for any special characters in the URI reference.

If the value of the icon attribute resolves to an HTTP URL, it may contain any of the following components:

  1. protocol scheme, typically http: or else https:
  2. username, followed by an "@"
  3. host name or IP address
  4. port number, which defaults to 80 for the http scheme and 443 for the https scheme
  5. absolute or relative path
  6. search query, indicated by "?"

If the protocol scheme, username, host name/IP address and port number are omitted the default is the current host - the same server as the base of the current document. If the path starts with a slash /..., it is an absolute path from the document root directory (AKA "web root") on the server. A relative path will be resolved relative to the base of the current document.

label
radiogroup
title Although title is one of the common attributes, which can be coded on any HTML element, it performs somewhat differently when coded on the command tag.
type="command"
type="checkbox"
type="radio"

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<command/> Tag Examples

Examples of the command element in HTML 5

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Changes in HTML 5 - <command/> Tag

What's new in HTML 5

The <command> tag is one of the new elements in HTML 5.

Differences between HTML 5 and earlier versions of HTML

The <command> tag did not exist in older versions of HTML.

The 2000-2010 Recommendations from the W3C HTML Working Group defined the HTML namespace for the names of all HTML element types, which now includes the command element name. In older (pre-2000) versions of HTML, element type names were not associated with a namespace.

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