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Practice 3

For this practice exercise, we are going to start with your practice 2 HTML code and text.

And we are going to use that to create 3 visually identical web pages using the 3 different types of CSS styling: internal, external, and inline.


If you need a refresher on how to create folders and files in VS Code, see the instructions for the previous practice exercise.

  1. Create a folder named 3

  2. Create a file inside named index.html

  3. Create another file named external.html

  4. And create a third file named inline.html

    index.html, inline.html, and external.html files

  5. Copy the HTML code and text from your practice 2 file and paste it into index.html, external.html, and inline.html


    Make sure the HTML code passes HTML validation before proceeding.

    After pasting, I am holding down CTRL and the letter S key to save the file on my Windows computer. On a Mac, you can hold down Command and the letter S key to save the file.

  6. Open each file in a separate tab in your web browser.

    You could drag the files to an open browser windowlike we did in the previous practice exercise.

    Or another option is to install the "Open in Browser" VS Code extension.

    See this page for information about managing VS Code extensions.

    After installing that extension, you can right-click on a file and select Open in Default Browser

  7. You will notice that the image you embedded using the img element does not show up on the page.

    Since the image file is inside the "2" folder and not inside our "3" folder, this URL no longer works:

    <img src="images/monkey.jpg" alt="A monkey riding an emu">

    Let's use this as an opportunity to learn more about relative URLs.

    In each HTML file, change the value of src to a relative URL that points to the file in your "2" folder.

    The relative URL needs to provide directions from the practice 3 HTML file to the image file within the "2" folder.

    The first step is to go back and leave the "3" folder. To indicate this in a relative URL, you use 2 dots, followed by a slash:


    dot-dot (..) means to go back a level in the folder structure. It's saying to leave the "3" folder in order to find the resource.

    Then, we need to go inside the "2" folder:


    And the image file is within a folder named "images":


    And to complete the relative URL, we need to provide the name of the image file:


    So, your img element will look something like this:

    <img src="../2/images/monkey.jpg" alt="purple monkey">

    After making changes to the code, you can save the file and then refresh the page in your browser to see the result.

  8. In index.html, use internal CSS to add styling to the page.

    No worries. It doesn't have to be pretty :) Feel free to have fun with this!

    Here are some suggestions for CSS properties you might want to experiment with:

    You can see an example here:

    Right-click on the page and select View Page Source to see the HTML code in the file.

  9. Use a class or ID or both. And use the class or ID as a selector in the CSS.

    For example, you could add a class to the h1 element:

    <h1 class="page-title">Issues at the Reference Desk</h1>

    And use a class selector in the CSS to provide styling:

    .page-title {
    color: red;
    font-style: italic;
  10. Make sure that your CSS code passes CSS validation.

    The simplest option is to copy your CSS code and paste it into the validator.


    Do not copy the <style> and </style> HTML tags. Only the CSS code.

  11. Create a new file named style.css

  12. In external.html add a stylesheet link in the head of the HTML.

  13. Copy the CSS code from index.html and paste it into your style.css file.


    Do not paste the <style> and </style> tags into style.css.

    Those are HTML tags. And the CSS file can only contain CSS code.

    You can see an example CSS file here:

  14. Add the class and/or ID in the HTML code of external.html

    See lesson 3 for more information about external CSS.

    When completed, external.html should look identical to index.html when viewed in a browser.

    You can see example files here:

  15. Replicate this styling in inline.html using inline CSS.

    All 3 pages should look identical when viewed in a browser.

    You can see an example here:

    Right-click on the page and select View Page Source to see the HTML code in the file.

  16. Push your changes to your Github repository.


    If you need a refresher on how to stage, commit, and push, see the instructions for the previous practice exercises.

  1. View your pages on the web:

  2. Make sure all 3 pages pass HTML and CSS validation.

    To check CSS validation on the web, you can enter the URL to the HTML file. The validator will retrieve the external stylesheet and check the code.

    Or you can enter the URL to the external CSS file: