program.html

<div id="seznam-programu"></div>
<script>
    var url = "https://fixnet.cz/programy-source-data";
    var el = document.getElementById("seznam-programu");

    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function(){
        if (xhr.readyState == 4 && xhr.status == 200){
            el.innerHTML = xhr.responseText;
        }
    };
    xhr.open("GET", url, true);
    xhr.send();
</script>