Css editor outdated

[nimo23]

Reproducer:

1. go to https://developer.mozilla.org/en-US/docs/Web/CSS/@layer and copy into css generic editor:

@layer state {
  .alert {
    background-color: brown;
  }
  p {
    border: medium solid limegreen;
  }
}

2. format the css
3. the formatted code looks ugly and the following error is shown: at-rule or selector expected [css- ruleorselectorexpected]

Moved issue from eclipse-wildwebdeveloper/wildwebdeveloper#1910