• Added the DOMParser API. It is spec-compliant, including producing <parsererror> elements, except that the produced documents do not have the same URL as the creating document (they instead always have "about:blank").
• Added strict XML parsing when using parsingMode: "xml". Creating documents will now fail, just like in a browser, when ill-formed XHTML markup is used.
• Added some rudimentary application of XML <!ENTITY declarations.
• Added window.frameElement, although without appropriate cross-origin security checks.
• Added the jsdom.evalVMScript public API.
• Added more custom request agent support: you can now pass agent and agentClass in addition to agentOptions. (@frarees)
• Updated our elements-being-disabled semantics to more closely match the spec, in particular with regard to being descendants of <fieldset disabled>.
• Updated FormData for recent spec fixes: blobs, files, and filenames should now all work like you'd expect.
• Updated the FormData constructor to use the proper, rather-complex, constructing the form data set algorithm.
• Fixed all constructors that appears as globals on the jsdom window object to be non-enumerable.
• Fixed <script> elements to load when they gain a src attribute while in a document.
• Fixed <link rel="stylesheet"> elements to load when their href attributes change while in a document.
• Fixed the loading of external <img>s (when the canvas npm package is installed) that were specified via relative URL; this regressed in 9.2.1.
• Fixed <iframe> documents to have the correct referrer value (viz. the URL of their parent).
• Fixed the value of input.checked inside click events on checkboxes.
• Fixed the window object's named properties to correctly return the <iframe> element or the <iframe>'s window in appropriate scenarios involving name vs. id attributes on the <iframe>. (@matthewp)