1. gap property for Flexbox

    `gap` for flexbox containers to create gaps/gutters between flex items

  2. CSS3 Multiple column layout

    Method of flowing information in multiple columns

  3. css property: column-gap: supported in flex layout

  4. css property: column-gap: supported in grid layout

  5. css property: column-gap: supported in multi-column layout

  6. css property: column-gap: supported in multi-column layout: `calc()` values

  7. css property: column-gap: supported in multi-column layout: `<percentage>` values

  8. css property: gap: supported in multi-column layout