how to keep track of navbar in html code example

Example 1: sticky operations in javascript

var siteHeader = document.getElementById('siteHeader'),
    siteNav = document.getElementById('siteNav');

    window.onscroll = function() {
        if ( siteNav.offsetTop < document.documentElement.scrollTop + 26 || siteNav.offsetTop < document.body.scrollTop + 26) {
            siteHeader.setAttribute("class","sticky");
        }
        else {
            siteHeader.setAttribute("class","");
        }
    }

Example 2: fixed navigation menu

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 1200px;
  font-size: 18px;
  font-family: sans-serif;
  color: #5D6063;
}

a:link,
a:visited {
  color: #5D6063;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.header {
  position: fixed;
  display: flex;
  justify-content: space-between;
  
  width: 100%;
  padding: 50px;
  background: #D6E9FE;
}