An easy way to get the device pixel ratio of a screen using JavaScript.
JavaScript
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README.md

GetDevicePixelRatio

Allows you to get the device pixel ratio using JavaScript.

Size and delivery

Currently, getDevicePixelRatio.js compresses to around 318 bytes (~0.3 KB), after minify and gzip. To minify, you might try these online tools: [Microsoft Ajax Minifier]:(http://ajaxmin.codeplex.com/), [Uglify]:(http://marijnhaverbeke.nl/uglifyjs), [Yahoo Compressor]:(http://refresh-sf.com/yui/), or Closure Compiler. Serve with gzip compression.

Sample

<script type="text/javascript">
	var devicePixelRatio = window.getDevicePixelRatio();
</script>

Support

GetDevicePixelRatio supports a broad range of browsers and devices (there are currently no known unsupported browsers).