website/assets/js/global.js

const parser = new DOMParser();

fetch("/assets/components/_bottomnav.html")
.then(response => response.text())
.then(text => {
    const bottomNavHTML = parser.parseFromString(text, "text/html");
    const bottomNav = bottomNavHTML.getElementById("bottomnav");

    const pathSpan = bottomNav.querySelector("span");
    pathSpan.innerText = pathSpan.innerText.replace("%PATH%", document.location.pathname);
    
    document.body.appendChild(bottomNav);
});