When you're including an image that's served from the same domain as your
page, use a site-root-relative URL (starting with "/"). Use this URL format
(starting from the site root) even if the image is in the same directory as
the page that includes it.
Insert the URL in the src attribute of your
alt="Alt text description of arrow image."
Insert the URL in parentheses after the image's alt text:
![Alt text description of arrow image.](/shared/images/arrow-24.png)