Петр

background: linear-gradient(to right, #1e5799 0%,#207cca 16%,#207cca 16%,#2989d8 16%,#7db9e8 100%);

var form = av.closest('form')[0];
var xmlhttp = new XMLHttpRequest();
xmlhttp.open(form.method, form.action, true);
xmlhttp.onreadystatechange = function(){
            if (xmlhttp.readyState == 4){
                if (xmlhttp.status == 200){
                    xmlhttp.responseText;
                } else {
                    // empty
                }
            }
        };
xmlhttp.send(new FormData(form));

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="24" height="24" viewBox="0 0 24 24">
   <path d="M9,5A3.5,3.5 0 0,1 12.5,8.5A3.5,3.5 0 0,1 9,12A3.5,3.5 0 0,1 5.5,8.5A3.5,3.5 0 0,1 9,5M9,13.75C12.87,13.75 16,15.32 16,17.25V19H2V17.25C2,15.32 5.13,13.75 9,13.75M17,12.66L14.25,9.66L15.41,8.5L17,10.09L20.59,6.5L21.75,7.91L17,12.66Z" />
</svg>