Alexander Kasheverov kashesandr

D3 US Map with Hover

Basic US map using D3 and topojson. Each state gets colored and neighbors should never be the same color. Also has some mousein/mouseout functions for highlighting the state your cursor is over

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

	<!DOCTYPE html>
	<html>
	<head>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<style>
	body { margin:0; padding:0; }
	#map { width:960px; height:500px; background:cyan; }
	</style>
	</head>
	<body>