v13.2.0

• Added support for MutationObservers! (@pmdartus)
• Added support for XML documents loaded in frames and iframes; previously this would error.
• Added the <progress> element's value, max, and position properties.
• Added navigator.plugins and navigator.mimeTypes. (But, they are always empty.)
• Fixed <summary> elements respond to click events by toggling their parent <details>.
• Fixed <summary> elements to be focusable.
• Fixed XML document DOCTYPE parsing to preserve any custom name values.
• Fixed XML documents to default to UTF-8, not windows-1252 like HTML documents do.
• Fixed all events fired by jsdom to have isTrusted set to true.
• Fixed DOMParser-created documents to have their readyState set to "complete".
• Fixed how nested <fieldset>s get disabled.
• Fixed getComputedStyle() to throw a sensible exception when passed the wrong argument, instead of one that exposes jsdom internals.
• Upgraded our saxes dependency, so that it now correctly errors on XML fragments like <foo bar:="1"/>.