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Debug CSS and layout problems using 3D view in Firefox

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Differen browsers have different debugging strengths and capabilities.

E.g. IE has great UI Responsiveness analyzer https://msdn.microsoft.com/en-us/library/ie/dn255009.aspx:

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Chrome has an excellent debugging plugin for AngularJS called Batarang https://chrome.google.com/webstore/detail/angularjs-batarang/ighdmehidhipcmcojjgiloacoafjmpfk:

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Firefox has a well hidden 3D view for displaying the composition of your UI https://developer.mozilla.org/en-US/docs/Tools/3D_View. It is not available by default. You have to enable it by:

  • Presse F12
  • Click Settings
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  • Check the “3D View” option
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  • Not the 3D view is available
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If you click it you get something like this:

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Showing you the different layers and the element you have selected.