About global properties of HTML, HTML so they can express richer and instruments to provide more useful features.
A, HTML original property
accesskey, class, dir, id, lang, style, tabindex, title (often used not presented)
1，accesskey
Role: The browser is used to create a keyboard shortcut to activate and focusing elements.
Value: a keyboard characters such as O
Scope: This property has a support element <a>, <area>, <button>, <input>, <label>, <legend>,<textarea>
Note: Use this property could possibly be shielded when a new browser window opens link
<div>
<a href="https://www.baidu.com" accesskey="b"> Baidu </a>
<a href="https://www.taobao.com" accesskey="a"> Ali </a>
<a href="https://www.qq.com" accesskey="t"> Tencent </a>
<P> shortcut (alt + b) can jump to Baidu; shortcut ( alt + a) can jump to Ali; shortcut (alt + t) can jump to Tencent </ P>
</ div>
2, you
Role: the direction of the text
Value: ltr / rtl / auto
3，tabindex
Role: the provisions of the tab order of elements
Value: number (1 is the first)
4，title
Role: provision of additional information about the elements, are prompt is displayed when the mouse over the text element.
Two, HTML5 new property
contenteditable,data-*,draggable,hidden,spellcheck
1 contenteditable
Role: Specifies whether the content can be edited in the browser
Value: true / false
Note: Setting document.designMode = 'on' time, anywhere on a page can be edited; used contenteditable = 'true' only to specific elements and acts element comprising
Mobile end: only support the property after moving the end ios5 and android3
2,draggable
Role: whether the user can drag elements
值: true / false / self
Note: The default links and images are draggable
3，hidden
Role: Shows or hides the element (and display: none same role)
值：hidden="" || hidden= "hidden"
4，spellcheck
Role: Specifies whether elements of spelling and grammar check for misspelled words will appear below the red line
Range: editable area (or contenteditable element form)
Value: true / false
Note: The mobile terminal support is not good
Reference: https://www.xiaohuochai.cc/posts/5a7eefb01453972fd0a53eeb