Summary

Reports whether or not the specified editor query command is supported by the browser.

Syntax

var isSupported = document.queryCommandSupported(command);

command

The command for which to determine support.

If the command is not supported, a NotSupportedError exception is thrown.

Otherwise:

• If the command has no value, or is disabled, an empty string is returned.
• The "fontSize" command is handled specially; if its value override is set, that gets converted to an integer number of pixels and returned as a legacy font size.
• If the command's value override is set, that gets returned.
• Otherwise, the command's value is returned, as would be returned by document.queryCommandValue() .

Example

Example needed

Browser compatibility

Specification

HTML Editing APIs: queryCommandSupported()