Spec version: hhttps://www.w3.org/TR/2017/CR-css-grid-1-20170209/

Example 1 is missing one closing bracket (2. bullet point, at @media print {)

Example 2 uses the → character - what's the purpose?

Example 31 is missing the closing comment after Equivalent to grid-area: 2 / 3;

Example 43 uses … instead of CSS comment

Thanks and keep up the good work!