Inline script prevents strict CSP

[alexkiro]

Describe the bug

There is this single line of inline script that prevent a strict CSP from working:

sphinx/sphinx/themes/basic/searchfield.html

Line 16 in eaebbec

<script>document.getElementById('searchbox').style.display = "block"</script>

sphinx/sphinx/themes/basic/searchbox.html

Line 12 in eaebbec

<script>document.getElementById('searchbox').style.display = "block"</script>

Currently this cause the searchbox to not appear if a strict Content-Security-Policy is being used. It seems like it would be relatively easy to fix and pass more rigours security audits.

How to Reproduce

Any built-in sphinx template would have this (tested with classic and albatros)

Environment Information

Sphinx==8.2.3

Sphinx extensions

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Additional context

There seems to be an old issue #3620 where CSP was resolved but this case may have been missed.