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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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function mySlowFunction(baseNumber) {
	console.time('mySlowFunction');
	var result = 0;	
	for (var i = Math.pow(baseNumber, 10); i >= 0; i--) {		
		result += Math.atan(i) * Math.tan(i);
	};
	console.timeEnd('mySlowFunction');
	return result;
}

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JavaScript Classes - ES5 vs ES6

An example that shows the difference between creating a JavaScript class and subclass in ES5 and ES6.

Reference

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accordion gallery zoom animation (css, responsive)

cat content ahead! ;-)

A Pen by Daniel Subat on CodePen.

License.

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Folding cards animation

A Pen by Dan Benmore on CodePen.

License.

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<div class="background"></div>
<div id="curve" class="card">
    <div class="footer">
        <div class="connections">
            <div class="connection facebook"><div class="icon"></div></div>
            <div class="connection twitter"><div class="icon"></div></div>
            <div class="connection behance"><div class="icon"></div></div>
        </div>
        <svg id="curve">
            <path id="p" d="M0,200 Q80,100 400,200 V150 H0 V50" transform="translate(0 300)" />