Can I somehow print the value of date attribute in css?

Hello! Want to try print the value of date attribute in the css :before
The problem is that I need this value to insert in the width, but not in content.
How do you think, is it possible? Use the stylus preprocessor. But still not good at it, it may be possible in a variable print the value of a date attribute, and then to substitute it in width?
Any ideas?)
June 10th 19 at 14:22
1 answer
June 10th 19 at 14:24
It is not yet possible, browsers are only able to content.

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