-It assist users who experience the web the website through means other than pixels in a browser window.
-In solid structure: There are ways to achieve the same usual result but some structure offers advantages like sematic tags. Sematig tags like header,nav,section and footer better organize markup into meaningful sections.
-Unorder list(ul):Is the best choice for list type and within the ul each navigation link is housed in an li.
-With site navigation you are more likely to use a relative link,which is refence to a file without the same directory as the referring page e.g “contact”.
-With online html editor, you can edit the html and click on button to view the results.