Commands
You can use commands to apply formatting and to carry out special actions on the text of a text range. You execute a command by using the execCommand method. You supply a command identifier and provide any additional command parameters. For example, you can change text to bold by using the Bold command as in the following Microsoft JScript (compatible with ECMA 262 language specification) example:
var rng = document.body.createTextRange();
rng.collapse();
rng.expand("sentence");
rng.execCommand("Bold");
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The above example makes bold all text up to the first period in the document.
Not all commands are available at all times. You can determine whether a command is available for a given text range by using the queryCommandEnabled and queryCommandSupported methods. For a list of commands, see Command Identifiers.
To determine whether a given command has already been applied to a text range, use the queryCommandState method to retrieve the state of the command. The state is true if the command has been applied.
