cssText for content pseudo-elements are missing quotes and invalid

[Clint Ayres]

Steps to reproduce:

// Note, assumes a style tag exists

const style = document.querySelector('style')[0];
style.sheet.insertRule('.test { content: "moo"; }');

// this is incorrect, missing quotes around _moo_
style.sheet.rules[0].cssText === ".test { content: moo; }";

style.sheet.insertRule(style.sheet.rules[0].cssText);

// this is actually correct because the cssText string above is invalid
style.sheet.rules[0].cssText === ".re-test {  }";

[Clint Ayres]

^ last link in the reproduction was incorrect. should be as follows:

// this is actually correct because the cssText string above is invalid
style.sheet.rules[0].cssText === ".test {  }";

[Radar WebKit Bug Importer]

<rdar://problem/51488597>

[Karl Dubost]

*** This bug has been marked as a duplicate of bug 118045 ***