Invalid CSS error

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I had upgraded the Mx 9.6.9 to 9.24.3. I had added the styling for reference selector in common section under appearance. After upgradation I’m getting this error. Styling in appearance: select{ option[value=” ”]{ display: none; } }  
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2 answers
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In the style property, only CSS for that element can be added. It seems like you want to add some selector, so that's indeed invalid.

To add full (S)CSS, you can edit it in files like these:

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For the CSS only solution you can go with what Johan said. But if i see your style it looks like you want the in such a way that, if the reference selector value is emty then you dont want it to be listed.
So why not add an Xpath constraint to the ReferenceSelector on the attribute itself. So that you only show those values which has some content in it?

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