Some web sites won't work properly when used with Site Lock if they pull resources (graphics, page elements, HTML style sheets, etc.) from other sites because Site Lock blocks all sites except the specific URL. The configured site is dependent upon having access to those other sites or "dependencies". The Dependencies section seen when editing a web link will show these in a list seperated by commas. When the configured web link is used in Site Lock, access to sites listed as dependencies for the link will also be allowed.
It can be difficult to discover which sites are needed by a site that's failing to display properly in Site lock, so it's rare that you will be entering your own list of dependencies. Instead, you'll more likely be reporting a non-working site to Securly support for us to troubleshoot and find the list of dependencies for you. Securly Support might provide you with the list of dependencies to add here, or if the site is a useful popular site, we may add the site to the Predefined web link list so that others may use it. For more information on this, see Predefined Web Links.