HTML <rt> Tag

The HTML <rt> tag marks the ruby text component of a ruby annotation.

Ruby annotations are often used in East Asian typography.

Ruby (also spelt rubi) characters are small, annotative glosses that can be placed above or to the right of a Chinese character when writing logographic languages such as Chinese or Japanese to show the pronunciation. Ruby annotations, are usually used as a pronunciation guide for relatively obscure characters.

Syntax

The <rt> tag is written as <rt></rt> with the ruby text inserted between the start and end tags.

Like this:

Examples

Basic Ruby Annotation

Here's an example of using the <rt> tag to present ruby text within a ruby annotation.

Omitting the End Tag

The <rt> element's end tag may be omitted if the <rt> element is immediately followed by an <rb>, <rt>, <rtc> or <rp> element, or if there is no more content in the parent element.

An <rb> element's end tag may be omitted if the <rb> element is immediately followed by an <rb>, <rt>, <rtc> or <rp> element, or if there is no more content in the parent element.

Therefore, the following example conforms to HTML5.

Fallback Content

You can use the <rp> element to provide fallback content for those browsers/user agents that don't support ruby annotations.

Like this:

Attributes

Attributes can be added to an HTML element to provide more information about how the element should appear or behave.

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

The <rt> element accepts the following attributes.

Element-Specific Attributes

This table shows the attributes that are specific to the <rt> tag/element.

AttributeDescription
none 

Global Attributes

The following attributes are standard across all HTML5 elements. Therefore, you can use these attributes with the <rt> tag , as well as with all other HTML tags.

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.

Below are the standard HTML5 event handler content attributes.

Again, you can use any of these with the <rt> element, as well as any other HTML5 element.

For a full explanation of these attributes, see HTML 5 event handler content attributes.

Differences Between HTML 4 & HTML 5

The <rt> element is new in HTML5.

For more information on the element, see HTML5 <rt> Tag. Also check out the links to the official specifications below.

Template

Here's a template for the <rt> tag with all available attributes for the tag (based on HTML5). These are grouped into attribute types, each type separated by a space. In many cases, you will probably only need one or two (if any) attributes. Simply remove the attributes you don't need.

For more information on attributes for this tag, see HTML5 <rt> Tag.

Tag Details

For more details about the <rt> tag, see HTML5 <rt> Tag.

Specifications

Here are the official specifications for the <rt> element.

What's the Difference?

W3C creates "snapshot" specifications that don't change once defined. So the HTML5 specification won't change once it becomes an official recommendation. WHATWG on the other hand, develops a "living standard" that is updated on a regular basis. In general, you will probably find that the HTML living standard will be more closely aligned to the current W3C draft than to the HTML5 specification.