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The <template></template> element in HTML is like a blueprint for content that you don't want to render right away. It's a way to store bits of HTML that you can clone and insert into your page later using JavaScript. This is super handy when you need to reuse the same structure multiple times, especially with dynamic data.

Why Use the <template></template> Element?

You might wonder why not just write the HTML directly or generate it all with JavaScript. The main advantage of <template></template> is that it keeps your markup clean and organized. Browsers won't render what's inside a <template></template> tag until you tell them to, which means no flash of unstyled or incomplete content.

Here are some common use cases:

• Repeating UI elements like cards, list items, or form fields
• Dynamically updating parts of a page without full reloads
• Keeping templates close to where they're used (in the HTML file itself)

How to Use <template></template> in Practice

Let's say you have a card layout that shows user profiles. Instead of building each one from scratch in JavaScript, you can define a template once and clone it as needed.

Here's how you'd set it up:

 <template id="user-card">
  <div class="card">
    <h3></h3>
    <p>Email: <span></span></p>
  </div>
</template>

Then, in JavaScript:

 const template = document.getElementById('user-card');
const newUserCard = document.importNode(template.content, true);
newUserCard.querySelector('h3').textContent = 'Jane Doe';
newUserCard.querySelector('span').textContent = 'jane@example.com';
document.body.appendChild(newUserCard);

This approach gives you structured, reusable blocks without messy string concatenation or repeated DOM creation.

Tips for Working with Templates

• Keep IDs unique – Since templates are cloned, avoid putting id attributes inside them unless you're sure they won't cause conflicts.
• Use classes for styling – Much safer than relying on IDs.
• Don't forget to deep clone – When using importNode , make sure to pass true as the second argument so nested nodes come along too.
• Place templates strategically – You can put them anywhere in the page — head, body, doesn't matter — but placing them near where they'll be used can help keep things readable.

One Thing People Often Miss

A lot of folks don't realize that everything inside a <template></template> is parsed but not executed. So scripts inside won't run until you add them to the page. That's great for security and performance, but if you're expecting something to execute immediately, it won't — unless you specifically trigger it after insertion.

基本上就這些。

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