<template id="sampleTemplate">
    <div><span&gt;</span></div>
</template>

<script>
// If browser supports templates
if ("content" in document.createElement("template")) {
    const template = document.querySelector("#sampleTemplate");
    // Clone the teplate and insert it into page
    const clone = template.content.cloneNode(true);
    let td = clone.querySelectorAll("span");
    td[0].textContent = "Coucou!";
    document.body.appendChild(clone);
}
</script>