The following are some of the open source projects I work on.

• elementQuery

  JavaScript70579

  An element query polyfill you can use today.

• viewportSize

  JavaScript36149

  Get the size of the CSS viewport using JavaScript.

• getEmPixels

  JavaScript828

  Allows you to accurately obtain an element’s em value in pixels using JavaScript.

• picturefill

  JavaScript695

  A Responsive Images approach that you can use today!

• directional-scss

  CSS7013

  Makes supporting CSS for left-to-right (LTR) and right-to-left (RTL) easy with SASS.

• viewportTester

  JavaScript10

  Bookmarklet that shows the CSS viewport size.

• breakpointInspector

  JavaScript50

  View the CSS media queries used on a page.

• GetDevicePixelRatio

  JavaScript717

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

• GetDevicePixelWidth

  JavaScript31

  An easy way to get the actual pixel width of a screen using JavaScript.

@tysonmatanich