JSFiddle - React, Tailwind, and code Playground

HTML

<div display="false">Test.</div>
<div display="true">Test.</div>
<div display="true">Test.</div>
<div display="false">Test.</div>
<div display="false">Test.</div>
<div display="false">Test.</div>

JavaScript

// Sample elements just to test. It can be XML Elements, sure.
var data = $("div");

// Slower first option (1.099ms on Firebug Profile):


data = data.filter(function (a) {
    return ($(this).attr('display') == "true");
});
data.each(function () {
    $(this).css({ color: "red" });
});



// Faster second option (1.037ms on Firebug Profile):
/*
data.each(function () {
    if ($(this).attr("display") == "true") {
        $(this).css({ color: "red" });
    }
});
*/