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Showing content from https://webplatform.github.io/docs/dom/TextRange/queryCommandValue below:

queryCommandValue · WebPlatform Docs

Returns the current value of the document, range, or current selection for the given command.

Method of dom/TextRangedom/TextRange

var object = document.queryCommandValue();

Data-type

BSTR

String that specifies a command identifier.

Returns an object of type DOM NodeDOM Node

Variant

Variant that returns the command value for the document, range, or current selection, if supported. Possible values depend on cmdID. If not supported, this method returns a Variant of type Boolean set to false.

The following example when using legacy document.selection will display an alert message of ‘false’ if the current selection is not 'bold’, or true if it is already ‘bold’

function makeBold(el){
if(window.getSelection){
    var sel=document.getSelection();
    var range= sel.getRangeAt(0),
    content = range.extractContents(),
    span = document.createElement('b');
    span.appendChild(content);
    var htmlContent = span.innerHTML;
    range.insertNode(span);
}else{
    var sel=document.selection;
    if(sel){
        var rng=sel.createRange();
        alert(rng.queryCommandValue('bold'));

        if(rng.queryCommandSupported('bold')){
            if(rng.queryCommandEnabled('bold')){rng.execCommand('bold',false,null);}
        }
    }
}
}

 Used for changing the HTML markup of web pages.

This method is a wrapper function for the command constants. You can obtain an IHTMLDocument2 interface using IID_IHTMLDocument2 for the IID. This method is a wrapper function for the command constants. You can obtain an IHTMLControlRange interface using IID_IHTMLControlRange for the IID. This method is a wrapper function for the command constants. You can obtain an IHTMLTxtRange interface using IID_IHTMLTxtRange for the IID.

• Microsoft Developer Network: [queryCommandValue Method Article]

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