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16. Add one more rule set for the :after pseudo-element of the navigation menu. This rule set should add empty space following the navigation menu, clear the content so it doesn't float, and display the content as a block element. 17. Test the page again. This time, the submenu should be displayed below the main menu. Play a video 18. At the bottom of the Speaker of the Month copy, change "Or meet us there!" to a link that plays the sampson.swf file in the media folder in a new tab or window. This link should say: "Or play video." Then, test this change. Change the bullets in the unordered list 19. Change the bullets in the unordered list to circles. Then, test this change. Validate and test in IE 20. When you've got everything working right, validate the HTML page and test it in IE. If you have any problems, fix them and test again in both Chrome and IE. Exercise 7-2 Add the navigation menu to the speaker's page 1. Add the navigation menu of exercise 7-1 to the speaker's page for Scott Sampson. To do that, you need to add the HTML for the menu to the file named sampson.html in the speakers folder, and you need to add the CSS for the menu to the file named speaker.css in the styles folder. 2. Test and adjust to get the formatting right if necessary. 3. In the HTML file, make sure the paths in the links for the navigation menu are correct. Because the sampson.html page is in the speakers folder and the index.html page is in the root folder, you'll need to use a document-relative path to go to this page. Also, none of the links in the navigation menu of the sampson.html page should be current. 4. Test to be sure that you can use the link for the Home menu item to return to the home page from the speaker's page. When this works, delete the link at the bottom of the aside that returns to the home page