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// Suboptimal, causes layout twice.
var newWidth = aDiv.offsetWidth + 10; // Read
aDiv.style.width = newWidth + 'px'; // Write
var newHeight = aDiv.offsetHeight + 10; // Read
aDiv.style.height = newHeight + 'px'; // Write
// Better, only one layout.
var newWidth = aDiv.offsetWidth + 10; // Read
var newHeight = aDiv.offsetHeight + 10; // Read
aDiv.style.width = newWidth + 'px'; // Write
aDiv.style.height = newHeight + 'px'; // Write
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