[6.x] Run the CP through the W3C validator #13550
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…older Internet Explorer versions, which are no longer supported. Modern browsers don't require it.
…uoted attribute values.
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I ran a lot of pages through the W3C validator to see if anything needed fixing.
I only found 2 minor issues—but there we go—a little cleanup 🧹
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />because it only exists to help IE, and not even Microsoft supports that anymore since 2022.