When Can Script Tags Have Only One Source?

Understanding Script Tags and Source Properties

When using <script> tags, it's important to understand their limitations. The <script> tag can either load a script from a URL or include the script directly within the tag body. However, it can only use one source at a time.

In the example you provided, you tried to load a script from a URL and also execute JavaScript within the same <script> tag:

<code class="html">&lt;script src=&quot;myFile.js&quot;&gt;
    alert("This is a test");
&lt;/script&gt;</code>

This code will not work because the <script> tag can't handle both a URL and inline JavaScript simultaneously. Instead, the inline JavaScript will be ignored.

To work around this limitation, you need to use multiple <script> tags:

<code class="html">&lt;script src=&quot;myFile.js&quot;&gt;&lt;/script&gt;
&lt;script&gt;
    alert("This is a test");
&lt;/script&gt;</code>

Now, the first script tag will load the external script, and the second script tag will execute the desired JavaScript.

In your example with the addScript function, you also encountered this issue. When you tried to load the addScript.js file and execute inline JavaScript within the same <script> tag, the inline script was ignored. You resolved this issue by using separate <script> tags to load the scripts and execute the necessary JavaScript.

It's important to remember that scripts loaded from URLs will execute sequentially, while inline scripts will execute immediately. This can affect the performance and functionality of your website, so you should plan your script loading and execution accordingly.

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