The HTMLObjectElement.typeMustMatch property is a Boolean reflects the typemustmatch attribute of the <object> element and indicates if the resouce linked by it must match the MIME type given by HTMLObjectElement.type in order for this resource to be used.
The HTMLOListElement interface provides special properties (beyond those defined on the regular HTMLElement interface it also has available to it by inheritance) for manipulating ordered list elements.
The HTMLParagraphElement interface provides special properties (beyond those of the regular HTMLElement object interface it inherits) for manipulating <p> elements.
The HTMLParamElement interface provides special properties (beyond those of the regular HTMLElement object interface it inherits) for manipulating <param> elements, representing a pair of a key and a value that acts as a parameter for an <object> element.
The HTMLPreElement interface expose specific properties and methods (beyond those defined by regular HTMLElement interface it also has available to it by inheritance) for manipulating block of preformatted text.
The HTMLProgressElement interface provides special properties and methods (beyond the regular HTMLElement interface it also has available to it by inheritance) for manipulating the layout and presentation of <progress> elements.
The HTMLQuoteElement interface provides special properties and methods (beyond the regular HTMLElement interface it also has available to it by inheritance) for manipulating quoting elements, like <blockquote> and <q>, but not the <cite> element.
The HTMLSelectElement.item() method returns the Element corresponding to the HTMLOptionElement whose position in the options list corresponds to the index given in parameter, or null if there are none.
The HTMLSelectElement.namedItem() method returns the HTMLOptionElement corresponding to the HTMLOptionElement whose name or id match the specified name, or null if no option matches.
The HTMLSourceElement interface provides special properties (beyond the regular HTMLElement object interface it also has available to it by inheritance) for manipulating <source> elements.
The HTMLSpanElement interface represents a <span> element and derives from the HTMLElement interface, but without implementing any additional properties or methods.
The HTMLStyleElement.scoped property is a Boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true).
The HTMLTableCaptionElement interface special properties (beyond the regular HTMLElement interface it also has available to it by inheritance) for manipulating table caption elements.
The HTMLTableCellElement interface provides special properties and methods (beyond the regular HTMLElement interface it also has available to it by inheritance) for manipulating the layout and presentation of table cells, either header or data cells, in an HTML document.
The HTMLTableColElement interface provides special properties (beyond the HTMLElement interface it also has available to it inheritance) for manipulating single or grouped table column elements.
The HTMLTableDataCellElement interface provides special properties and methods (beyond the regular HTMLTableCellElement and HTMLElement interfaces it also has available to it by inheritance) for manipulating the layout and presentation of table data cells in an HTML document.
The HTMLTableElement interface provides special properties and methods (beyond the regular HTMLElement object interface it also has available to it by inheritance) for manipulating the layout and presentation of tables in an HTML document.