This lab is designed to get you to work more with CSS, and to get you to try a validator.
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First, we suggest that you do not use Internet Explorer for this or subsequent work in this course: it mangles HTML files it downloads. Use Firefox or Safari instead. Make a copy of your XHTML from lab 2. For this part, you will create a new stylesheet for this page. Change the XHTML file so it uses a stylesheet. Create a CSS file ( lab4-style.css) and make these changes to the appearance of the page:- Set the background colour of the <body>to light yellow (colour code#ff7), and the text colour to black (colour code#000).
- Give the <body>a margin of two times the font size (2em).
- Set the font of the <h1>to a sans-serif font.
- Give the <h1>a thin black border. You need to set the border's colour, line style, and thickness.
- Change the background colour of the <h1>to a lighter shade of yellow (colour code#ffa).
 You will probably want to look at the CSS reference as you do this. 
- Set the background colour of the 
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Download this invalid XHTML file and the image from the page. [Again, use anything other than Internet Explorer.] Add the XHTML 1.0 doctype to the start of this file: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">Run it through an XHTML validator and have a look at the error messages. Fix the errors in the markup. (When working with the validator, look at only the first error or two; fix them and try again.) Once the page validates with no errors, you're done. 
When you're done, upload the files from this lab to the course web server.  Create a text file named handin.txt using your favourite text editor. Write your name, student number, SFU e-mail ID, and the URLs of your created web-pages in this file. Use the Submission server to submit your text file.