jQuery .width()

jQuery .width() gets or sets width of the target element;

$(DOMElement).width(); // Element width
$(DOMElement).innerWidth(); // Element width + padding
$(DOMElement).outerWidth(); // Element width + padding + border
$(DOMElement).outerWidth(true); // Element width + padding + border + margin

Also check jQuery .height()

<script>
$(function(){
    var target_width = $('.target').width(); // get target width
    $('.target2').width( target_width ); // set target width
    $('.target2 .width2 span').text( target_width );
    $('.innerWidth_log span').text( $('.target').innerWidth() );
    $('.outerWidth_log span').text( $('.target').outerWidth() );
});</script>
<div class="well target">
    <span class="label label-warning">.target</span>
    <p>set in css:
        <span class="label label-info">width: 400px;</span>
        <span class="label label-info">padding: 10px;</span>
        <span class="label label-info">margin: 12px;</span>
        <span class="label label-info">border: 2px;</span>
    </p>
    <p>get values by 
</div>
 
<div class="target2">
    <span class="label label-success width2">width:<span></span></span>
    <span>width of this block set by jQuery (same as prev block)</span>
</div>
 
<div class="well">
    get .target properties with jQuery:
    <span class="label label-success innerWidth_log">
        innerWidth: <span></span>
    </span>
 
    <span class="label label-success outerWidth_log">
        outerWidth: <span></span>
    </span>
 
</div>
.target {
    width:400px;
    padding:10px;
    margin:12px;
    border:2px solid #bbb;
}
 
.target2 {
    background: #ccc;
    margin:10px 0;
}

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