• Added an initial implementation of ElementInternals, including the shadowRoot getter and the string-valued ARIA properties. (zjffun)
• Added the string-valued ARIA attribute-reflecting properties to Element.
• Fixed history.pushState() and history.replaceState() to follow the latest specification, notably with regards to how they handle empty string inputs and what new URLs are possible.
• Fixed the input.valueAsANumber setter to handle NaN correctly. (alexandertrefz)
• Updated various dependencies, including cssstyle which contains several bug fixes.