revision:
The src attribute specifies the location (URL) of the external resource.
The src attribute can be used on the following elements: <audio>, <embed>, <iframe>, <img>, <input>, <script>, <source>, <track>, <video>
<element src="url"></element>
url indicating a file or resource. There are two types of URL links: absolute URL points to another webpage and relative URL points to other files of the same web page.
Click on the play button to play a sound:
<p class="spec">Click on the play button to play a sound:</p>
<audio style="margin-left:3vw;" src="../../pics/horse.wav" controls>
Your browser does not support the audio element.
</audio>
Click on the image, and the input will be sent to a page on the server called "/action_page.php".
<p class="spec">Click on the image, and the input will be sent to a page
on the server called "/action_page.php".</p>
<form style="margin-left:3vw;" action="/action_page.php">
<label for="fname">First name:</label>
<input type="text" id="fname" name="fname"><br><br>
<input type="image" src=",,.../pics/submit.gif" alt="Submit" width="24" height="24">
</form>