To enable background color for html element, you just need to have a background color set for the html element as shown below:
in the style part of the header or the CSS file.
By doing this, if the html element is a background image of text, you can add background color to the text.
So even if images are turned off, you would still see a background for the text.
To add background color for an html element say “a heading tag”, you can do as shown below:
background: color url(images/imagename.png);