CSS sanitizing drops style following an extra semi-colon

[ziftytodd]

When sanitizing CSS, if you give it this string of CSS
color:#292f33;;font-size:28px;padding:0px;

The result will be
color:#292f33 ; padding:0px ;

Which is missing the font-size style entirely. However, if the extra semi-colon after the color style is removed, then font-size is preserved.

[Slayer95]

Simple reproduction:

let called = false;
parseCssDeclarations(';margin:auto', {
  declaration: () => called = true,
});
called; // Still false