title: highlight the navigation menu for the current page
body: <p>In a page with some navigation links,I want the link of the current page are hightlighted,just like this:</p>
  <p><img src="https://i.stack.imgur.com/3aBzu.jpg" alt="alt text" /></p>
  <p>The link &quot;<strong>HTML Attributes</strong>&quot; is highlighted(bolded) since this link will take one to the current page.</p>
  <p>I know this can be implemented manually(just hightlighted the according link,but is there some smart way? highlight the right link dynamically and automatically?</p>