Magento – Magento 1.9: Merge CSS breaking frontend UI

magento-1.9merge-css

Recently I tried enabling CSS merge inside System->Configuration->Developer

But this is breaking complete UI in front end. ** It seems like CSS os having issues & I have to make CSS error free**.

Can anyone list out what points have to check in CSS to avoid such issues.

Best Answer

Copy the content of your CSS and copy it into the W3C validator: https://jigsaw.w3.org/css-validator/

It will list the errors and once you've fixed them, merge CSS will come back normal

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