Why is the background-attachment:fixed image not showing on mobile Chrome?

Question

css

Good afternoon, ladies and gentlemen!
Why is the image in a DIV with background-attachment:fixed not showing on mobile Chrome?
On a stationary computer, everything works, when you enter from a mobile browser, the image is not shown at all.
The CSS code is like this:

.mainarea {
  background:url("../images/bgblue.jpg") no-repeat;
  background-size:cover;
  background-attachment: fixed;
  height: calc(100%);
}