HTML <script> and <noscript> Elements
The <script> element embeds executable code or loads an external script. For JavaScript, the modern default is simply <script>; the old language="JavaScript" attribute and type="text/javascript" are unnecessary.
<script src="app.js" defer></script>Inline JavaScript Top ↑
<script>
document.querySelector('#message').textContent = 'JavaScript is running';
</script>For maintainable sites, external JavaScript files are often easier to cache and reuse.
defer, async and modules Top ↑
deferdownloads a classic external script without blocking HTML parsing and executes deferred scripts in document order after parsing.asyncis useful for independent external scripts; execution order is not guaranteed.type="module"enables JavaScript modules. Module scripts are deferred by default.
<script src="site.js" defer></script>
<script src="analytics.js" async></script>
<script type="module" src="main.js"></script>The <noscript> element Top ↑
<noscript> can provide fallback information when scripting is disabled or unsupported. Important content and basic navigation should not depend entirely on JavaScript when a normal HTML alternative is practical.
<noscript>Please enable JavaScript to use the interactive calculator.</noscript>Common mistakes Top ↑
Avoid parser-blocking scripts in the document head unless they truly need to run before parsing continues. Do not use document.write() for normal page construction, and do not assume async preserves dependency order.
HTML <head> JavaScript enabled check jQuery tutorials
Subhendu Mohapatra
Author & Instructor at plus2net
I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.
| dany | 23-02-2010 |
| it is very nice.... | |
| babs | 16-07-2013 |
| pls any one give me the coorect answer for how to stop the execution of client side scripting | |
| smo | 17-07-2013 |
| No, this is not possible. But you can have control over it by triggering stop code by some time delay or user action. There are some other ways like Ajax by which you can look back to server to control rest of the script. It can better explained by some examples. What is your requirement? | |