Gary Pendergast f5f5da1fff Customizer: Improve browser compatibility of the preview iframe.
When `home` and `siteurl` are different, the customizer preview iframe will be blank in Chrome and Safari, due to their `X-Frame-Options` implementation quirks.

Changing this to `SAMEORIGIN` and adding the `frame-ancestors` Content Security Policy gives the correct behaviour.

Props fullyint.
Fixes #40020.



git-svn-id: https://develop.svn.wordpress.org/trunk@44580 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-14 06:37:30 +00:00
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243 MiB
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PHP 80.5%
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