When using a code validator to check your HTML, CSS, or JavaScript code, it's essential to address errors in a systematic manner. The correct approach is to correct the first reported error before revalidating. This method is recommended because often, the first error can cause a cascade of subsequent errors or warnings. By fixing the first error, you may automatically resolve other errors that were reported later.

Reasoning:

Cascading Errors: The first error in the code might lead to multiple subsequent errors. Fixing it can sometimes resolve those cascading errors, reducing the overall number of errors in the next validation.

Logical Flow: Addressing errors in the order they appear maintains a logical flow and makes debugging more manageable.

Steps to Follow:

Step 1: Run the code through the validator.

Step 2: Identify the first reported error.

Step 3: Correct the first error.

Step 4: Revalidate the code to check if the error count has reduced or if new errors appear.

Step 5: Repeat the process until all errors are resolved.

References:

W3C Markup Validation Service

MDN Web Docs - Debugging HTML

W3C CSS Validation Service

To ensure that a message appears if the user’s browser does not support the audio files on a web page, the developer should use the

Correct Usage:

Fallback Content: Place the message as fallback content inside the

Example:

No mpeg support.

Explanation of Options:

Option A: Incorrect. The alt attribute is not valid for the element.

Option B: Incorrect. The alt attribute is not valid for the

Option C: Incorrect. The alt attribute is used incorrectly in the

Option D: Correct. The message "No mpeg support." is placed correctly as fallback content inside the

References:

W3C HTML5 Specification - The audio element

MDN Web Docs -

Using the fallback content inside the

The given code snippet demonstrates how JavaScript can manipulate the DOM to change the style of an element.

Code Analysis:

Given the HTML:

Blog Title

Click Here

When the button is clicked, the JavaScript code within the onclick attribute changes the color of the h1 element to red.

Explanation:

Option A: An event handler tracking keyboard strokes is incorrect because the event handler is tracking a mouse click, not keyboard strokes.

Option B: JavaScript is using the DOM to make a style change is correct because the onclick attribute contains JavaScript code that modifies the style of the h1 element.

Option C: In-line CSS is styling the

tag is incorrect because the style change is done via JavaScript, not inline CSS.

References:

MDN Web Docs - Document.getElementById()

W3Schools - JavaScript HTML DOM