JSFiddle - React, Tailwind, and code Playground

HTML

<div style="width:300px;">300px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:350px;">350px</div>
<div style="width:50px;">50px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:300px;">300px</div>
<div style="width:400px;">400px</div>
<div style="width:500px;">500px</div>
<div style="width:300px;">300px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:350px;">350px</div>
<div style="width:50px;">50px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:300px;">300px</div>
<div style="width:400px;">400px</div>
<div style="width:500px;">500px</div>
<div style="width:300px;">300px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:350px;">350px</div>
<div style="width:50px;">50px</div>
<div style="width:100px;">100px</div>
<div style="width:200px;">200px</div>
<div style="width:300px;">300px</div>
<div style="width:400px;">400px</div>
<div style="width:500px;">500px</div>

CSS

div {
    border: 1px solid red;
    margin: 20px;
    padding: 20px;
}

JavaScript

// Extend jQuery ":" pseudo selector to include a width() test
// Inspired by http://james.padolsey.com/javascript/extending-jquerys-selector-capabilities/
$.extend( $.expr[':'], {
    width: function ( element, index, selectorMatches ) {
        var expr = selectorMatches[3].match( /^\s*([<>]?={0,1})?\s*(\d+)\s*$/ ),
            elementWidth = $( element ).width(),
            targetWidth, comparisonOperator;
        
        if ( ! expr ){
            console.log( "invalid expression" );
            return false;
        }
        
        comparisonOperator = expr[1] || "==";
        targetWidth = parseInt( expr[2] );
        
        return eval( elementWidth + comparisonOperator + targetWidth );
    }
});


// Valid expressions are:
// :width( 200 ), :width( = 200 ), :width( == 200 )
// :width( > 200 ), :width( >= 200 )
// :width( < 200 ), :width( <= 200 )
$('div:width( 200 )').hide();