HTMLElement

参考文档：MDN HTMLElement

一、继承关系

1. 所有HTML元素都是由HTMLElement或者其更具体的子类型来表示的。
2. HTMLElement继承自Element，并实现了GlobalEventHandlers和TouchEventHandlers.

二、属性方法

1. HTMLElement的普通属性
   1. 继承自父接口Element的属性

      例：innerHTML, className, id

   2. 自身属性

属性名称	属性类型	Description
HTMLElement.accessKey	DOMString	分配给元素的access key
HTMLElement.accessKeyLabel	DOMString	A string that represents the element's assigned access key.
HTMLElement.contentEditable	DOMString	获取/设置元素的可编辑状态
HTMLElement.isContentEditable 只读	Boolean	指示元素的内容是否可被编辑
HTMLElement.dataset 只读	DOMStringMap	允许读写元素的自定义data特性(data-*)
HTMLElement.dir	DOMString	获取/设置元素的方向
HTMLElement.draggable	Boolean
HTMLElement.dropzone 只读	DOMSettableTokenList
HTMLElement.hidden	Boolean
HTMLElement.itemScope	Boolean
HTMLElement.itemType 只读	DOMSettableTokenList
HTMLElement.itemId	DOMString
HTMLElement.itemRef 只读	DOMSettableTokenList
HTMLElement.itemProp 只读	DOMSettableTokenList
HTMLElement.itemValue	any
HTMLElement.lang	DOMString	获取/设置元素属性、文本、内容的语言（Gets/sets the language of an element's attributes, text, and element contents）.
HTMLElement.offsetHeight 只读	double	The height of an element, relative to the layout.
HTMLElement.offsetLeft只读	double	The distance from this element's left border to its offsetParent's left border.
HTMLElement.offsetParent只读	Element	The element from which all offset calculations are currently computed.
HTMLElement.offsetTop只读	double	The distance from this element's top border to its offsetParent's top border.
HTMLElement.offsetWidth只读	double	The width of an element, relative to the layout.
HTMLElement.properties 只读	HTMLPropertiesCollection
HTMLElement.spellcheck	Boolean	Controls spell-checking (present on all HTML elements)
HTMLElement.style	CSSStyleDeclaration	An object representing the declarations of an element's style attributes.
HTMLElement.tabIndex	long	Gets/sets the position of the element in the tabbing order.
HTMLElement.title	DOMString	A string that appears in a popup box when mouse is over the element.
HTMLElement.translate	Boolean

1. HTMLElement的Event handlers属性
   1. 实现了GlobalEventHandlers的event属性：所有onXYZ形式（如：onClick）
   2. 自身属性

      HTMLElement.onTouchStart 

      Returns the event handling code for the touchstart event.

      HTMLElement.onTouchEnd 

      Returns the event handling code for the touchend event.

      HTMLElement.onTouchMove 

      Returns the event handling code for the touchmove event.

      HTMLElement.onTouchEnter 

      Returns the event handling code for the touchenter event.

      HTMLElement.onTouchLeave 

      Returns the event handling code for the touchleave event.

      HTMLElement.onTouchCancel 

      Returns the event handling code for the touchcancel event.

2. HTMLElement的方法
   1. 继承自父接口Element的方法
   2. 自身方法

Name & Arguments	Return	Description
HTMLElement.blur()	void	从当前已经获得焦点的元素上移除键盘焦点(Removes keyboard focus from the currently focused element).
HTMLElement.click()	void	在该元素上触发click事件(Sends a mouse click event to the element).
HTMLElement.focus()	void	让当前元素获取焦点(Makes the element the current keyboard focus).
HTMLElement.forceSpellCheck()	void