how to blur text to that of background colour code example

Example 1: how to do a background blur in css

/* Answer to "blur behind element css" */

/*
	This blurs everything behind the element it's applied to
*/

backdrop-filter: blur(10px);

Example 2: php code to display a div with background fade

body {
    background: url('http://placehold.it/1600x1200') no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}