i've been tried some code :
a.html :

<div class="content">
    <a href="howto_google_maps.asp">Google Maps</a><br>
    <a href="howto_css_animate_buttons.asp">Animated Buttons</a><br>
    <a href="howto_css_modals.asp">Modal Boxes</a><br>
    <a href="howto_js_animate.asp">Animations</a><br>
    <a href="howto_js_progressbar.asp">Progress Bars</a><br>
    <a href="howto_css_dropdown.asp">Hover Dropdowns</a><br>
    <a href="howto_js_dropdown.asp">Click Dropdowns</a><br>
    <a href="howto_css_table_responsive.asp">Responsive Tables</a><br>
</div>

b.html (1st trial), i got this from w3schools :

<html>
<head>
<script src="js/jquery-3.3.3.min.js"></script>
<script>
    function includeHTML() {
        var z, i, elmnt, file, xhttp;
        /*loop through a collection of all HTML elements:*/
        z = document.getElementsByTagName("*");
        for (i = 0; i < z.length; i++) {
            elmnt = z[i];
            /*search for elements with a certain atrribute:*/
            file = elmnt.getAttribute("w3-include-html");
            if (file) {
                /*make an HTTP request using the attribute value as the file name:*/
                xhttp = new XMLHttpRequest();
                xhttp.onreadystatechange = function() {
                    if (this.readyState == 4) {
                    if (this.status == 200) {elmnt.innerHTML = this.responseText;}
                    if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
                    /*remove the attribute, and call this function once more:*/
                    elmnt.removeAttribute("w3-include-html");
                    includeHTML();
                }
            }      
            xhttp.open("GET", file, true);
            xhttp.send();
            /*exit the function:*/
            return;
            }
        }
    };
</script>
</head>
<body>
    <p>Testing to call content from another html file</p>
    <div w3-include-html="a.html"></div>

    <script>
      includeHTML();
    </script>
</body>
</html>

b.html (2nd trial), while this i got from stackoverflow forum :

 <html>
    <head>
    <script src="js/jquery-3.3.3.min.js"></script>
    <script>
        <script> 
        $(function(){
            $("#includedContent").load("a.html"); 
        });
    </script>
    </script>
    </head>
    <body>

        <p>Testing to call content from another html file</p>
        <div id="includeContent"></div>

    </body>
    </html>

but still don't work. do i have a mistake or something ? helping me to solve this i would appreciate it.
thanks in advance brothers/sisters.

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