- Add a little `time` here and there.
- Add `kbd` elements to the explanation of access keys.
- Some uses of the `kbd` element were used for commands, but these commands are themselves `code`.
- Changed `<blockquote><pre>` to `<code><pre>`.
- Update CSS.

**NOTE: Untested!** I don’t know how to set up a server to test these changes. I tried my best to be careful with the changes.

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- Use `sections` to group each checked URL
- Use a `data-url-checked` attribute on the `section` (to make scraping or client-side DOM manipulation easier)
- Updated to use HTML5 `progress` element