background

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Syntax: <bg-layer>#? , <final-bg-layer>

| Chrome | Firefox | Safari |  Edge  |  IE   |
| :----: | :-----: | :----: | :----: | :---: |
|   1    |    1    |   1    |   12   |   4   |