HTML <template> id Attribute

HTML <td>

HTML <textarea>

An id on a <template> tag assigns an identifier to the template.

The identifier must be unique across the page.

Example

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An id attribute on a <template> element.
Each time the button is clicked an item is added to the list.

Item 1

<template id="item-template">
  <li></li>
</template>

<ul id="list">
  <li>Item 1</li>
</ul>

<button onclick="add();">Add List Item</button> <br />

<script>
  let itemCount = 1;

  let add = () => {
     itemCount++;
  
     let template = document.getElementById("item-template");  
     let content = template.content;
     content.querySelector('li').textContent = "Item " + itemCount;
  
     let row = template.content.cloneNode(true);

     document.getElementById("list").appendChild(row);
  }
</script>

Using id

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The id attribute assigns an identifier to the <template> element.

The id allows JavaScript to easily access the <template> element.

It is also used to point to a specific id selector in a style sheet.

Tip: id is a global attribute that can be applied to any HTML element.

Syntax

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<template id="identifier" />

Values

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Value	Description
identifier	A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

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A <template> with a unique id.
Each time the button is clicked a new row (i.e. template row) is added to the table.

ID	Customer Name
1

<style>
  table.tb { width:300px; border-collapse: collapse; }
  .tb th, .tb td { border: solid 1px #777; padding: 5px; }
  .tb th { background: lightblue; }
</style>

<template id="mytemplate">
  <tr>
    <td><span></span></td>
   <td><input type="text" name="name[]" value=""></td>
  </tr>
</template>

<table id="user-table" class="tb">
 <tr>
  <th>ID</th>
  <th>Customer Name</th>
 </tr>
  <tr>
    <td><span>1</span></td>
   <td><input type="text" name="name[]" value="Anna Kroger"></td>
  </tr>
</table>

<button onclick="addRow();">Add Customer</button>

<script>
  var counter = 1;

  let addRow = () => {
     counter++;
  
     let template = document.getElementById("mytemplate");  
     let content = template.content;
     content.querySelector('span').textContent = counter;
  
     let row = template.content.cloneNode(true);

     document.getElementById("user-table").appendChild(row);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <template>.

When the button is clicked, JavaScript locates the <template> through the id.

It extracts the <template> content and add it as the last child of the table.

Browser support

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Here is when id support started for each browser: