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Showing content from https://webplatform.github.io/docs/dom/KeyboardEvent/ctrlLeft below:

ctrlLeft ยท WebPlatform Docs

ctrlLeft

Property of dom/KeyboardEventdom/KeyboardEvent

Syntax 
var result = element.ctrlLeft;
element.ctrlLeft = value;
Examples

The following example shows how to use the ctrlLeft property to indicate when the user presses the left or right CTRL keys.

<HEAD>
<SCRIPT>
function init() {
    spanLeftCtrl.innerText='false';
    spanRightCtrl.innerText='false';
}

function indicate(obj, arg) {
    obj.innerText=arg;
}

function CtrlDown() {
    if (event.ctrlLeft) {
        indicate(spanLeftCtrl,'true');
    }
    else {
        if (event.ctrlKey) {
            indicate(spanRightCtrl,'true');
        }
    }
}

function CtrlUp() {
    if (!event.ctrlKey) {
        indicate(spanLeftCtrl,'false');
        indicate(spanRightCtrl,'false');
    }
}
</SCRIPT>
</HEAD>

<BODY onload="document.body.focus(); init()" onkeydown="CtrlDown();" onkeyup="CtrlUp();">

<P>Press either the left or right CTRL key.</P>
<TABLE>
<TR>
<TD><I>Left CTRL Key Pressed</I></TD>
<TD><I>Right CTRL Key Pressed</I></TD>
</TR>
<TR>
<TD ALIGN="center"><SPAN ID="spanLeftCtrl"></SPAN></TD>
<TD ALIGN="center"><SPAN ID="spanRightCtrl"></SPAN></TD>
</TR>
</TABLE>
</P>
</BODY>

View live example

Notes Remarks

This property is currently supported only in Microsoft Windows NT 4.0 and Windows 2000. The Document must have focus for this property to return true.

Syntax Attributions

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