HTML 5 <bb> Tag

This tag has now been removed from the HTML5 specification (which is still in draft status at time of writing). Rather than remove this article altogether, I have decided to keep it here for reference.

The HTML <bb> tag is used for specifying a user agent/(browser) command that the user can invoke.

For example, the <bb> tag can be used to download a website as a standalone application.

The <bb> tag was introduced in HTML 5.


This example demonstrates how to write the <bb> element into your HTML code.

Note: At the time of writing, the <bb> element has limited (if any) browser support. This example is based on the W3C HTML 5 Working Draft, and is solely to demonstrate the context of this tag.


HTML tags can contain one or more attributes. Attributes are added to a tag to provide the browser with more information about how the tag should appear or behave. Attributes consist of a name and a value separated by an equals (=) sign, with the value surrounded by double quotes. Here's an example, style="color:black;".

There are 3 kinds of attributes that you can add to your HTML tags: Element-specific, global, and event handler content attributes.

The attributes that you can add to this tag are listed below.

Element-Specific Attributes

The following table shows the attributes that are specific to this tag/element.

typeSpecifies the type of command.

Possible values:

  • makeapp (Make application)

Global Attributes

The following attributes are standard across all HTML 5 tags (although the tabindex attribute does not apply to dialog elements).

For a full explanation of these attributes, see HTML 5 global attributes.

Event Handler Content Attributes

Event handler content attributes enable you to invoke a script from within your HTML. The script is invoked when a certain "event" occurs. Each event handler content attribute deals with a different event.

For a full list of event handlers, see HTML 5 event handler content attributes.