This follows the document standard of using `<code class="literal"></code>` to wrap anything referencing code, see lines:
  - 44
  - 52
  - 55
  - 58
  - 64
  - 67
  - ...many others

Of the above, there are cases where the precedent is set for using `<code>` (both `class="literal"` and not) to set apart variable names:
  - Line 64 wraps the `navigator.userAgent` variable in `<code class="literal">`
  - Line 67 wraps the `window` variable in `<code>`

Additionally, throughout the document, `<code class="literal">` is used to set apart any number of things, ranging from filenames (lines 44 and 55, for example) to referencing the _names_ (not calling) of methods (lines 55, 58, 96, etc.), among many other uses.