Do you provide shell, terminal, or other command line examples on your site? Learn how to style them with CSS using a custom, lightweight plugin for Prism.
Updated on 12/30/2015: The Command Line plugin is now part of the Prism project, but it may be converted from a plugin to a language add-on. I've left this blog entry here for reference.
When the W3C Markup Validation Service couldn't connect to my site using HTTPS, this simple configuration change resolved the issue.
A few days ago, someone pointed out that the HTML validation link in my footer was leading to an error message. Invalid markup? Surely not! I clicked the link to load the W3C Markup Validation Service and it screamed "Sorry! This document cannot be checked." The error message stated "500 Can't connect to chriswells.io:443" and "If you made recent changes to your domain name (DNS) configuration, you may also want to check that your domain records are correct, or ask your hosting company to do so."