The HTMLMediaElement.src property reflects the value of the HTML media element's src attribute, which indicates the URL of a media resource to use in the element.
The HTMLMetaElement interface contains descriptive metadata about a document. It inherits all of the properties and methods described in the HTMLElement interface.
The HTMLModElement interface provides special properties (beyond the regular methods and properties available through the HTMLElement interface they also have available to them by inheritance) for manipulating modification elements, that is <del> and <ins>.
The HTMLObjectElement interface provides special properties and methods (beyond those on the HTMLElement interface it also has available to it by inheritance) for manipulating the layout and presentation of <object> element, representing external resources.
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.
HTML script elements expose the HTMLScriptElement interface, which provides special properties and methods (beyond the regular HTMLElement object interface they also have available to them by inheritance) for manipulating the layout and presentation of <script> elements.
The HTMLSelectElement.autofocus property is a Boolean that reflects the autofocus HTML attribute, which indicates whether the associated <select> element will get input focus when the page loads, unless the user overrides it.
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.