CSS speak-header

The CSS speak-header property is used in aural media to specify whether table headers are spoken before each cell, or only before each cell if that cell uses a different header to the previous cell.

In HTML5, header information can be specified with two different attributes (headers and scope). See the <th> tag for more information.

HTML 4 also had the axis attribute, but this has been removed from HTML5. See the HTML 4 <th> tag for more information.

Syntax

Possible Values

once
The header is spoken one time, before a series of cells.
always
The header is spoken before every pertinent cell.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial
Represents the value specified as the property's initial value.
inherit
Represents the computed value of the property on the element's parent.
unset
This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

General Information

Initial Value
once
Applies To
Elements with table headers
Inherited?
Yes
Media
Aural

Example Code

Official Specifications

Browser Support

Browser support for CSS properties can vary, particularly for newer or experimental features. Check current browser compatibility before using a property in production, especially when supporting older browsers.

Initial Value

CSS properties have an initial value that applies when the property has not been explicitly set. The initial value is different from the value inherited from a parent element and may vary between properties.

Inheritance

Some CSS properties inherit their computed value from their parent element by default, while others do not. The inherit, initial, unset, and revert keywords can also be used to control how a property gets its value.

Vendor Prefixes

Most modern CSS properties use the standard, unprefixed syntax. Vendor-prefixed properties such as -webkit- are mainly relevant to older browser versions or specific features and should only be used when required by your browser support targets.