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HTML 5 Standard Attributes

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The attributes listed below are standard and are supported by all HTML 5 tags, with a few exceptions.

Differences Between HTML 4.01 and HTML 5

New attributes in HTML 5: contenteditable, contextmenu, draggable, irrelevant, ref, registrationmark, and template.

HTML 4.01 attributes which are no longer supported: accesskey.


  • 4: indicates if the attribute is defined in HTML 4.01
  • 5: indicates if the attribute is defined in HTML 5
Attribute Value Description 4 5
acceskey a character Sets a keyboard shortcut to access an element. Not supported. 4  
class class_rule or style_rule The class of the element. Used to specify a class in the stylesheet 4 5
contenteditable true
Sets if the user is allowed to edit the content in the element or not   5
contentextmenu id of a menu element Sets a context menu for an element   5
dir ltr
Sets the text direction 4 5
draggable true
Sets if the user is allowed to drag the element or not   5
id id_name A unique id for the element. Used with CSS or JavaScript 4 5
irrelevant true
Sets if the element is irrelevant or not. Irrelevant elements is not displayed   5
lang language_code Sets the language code for the enclosed element 4 5
ref url or elementID Refers to another document / another part of the document. Use only if the template attribute is set   5
registrationmark registration mark Sets a registration mark to an element. Use only on child elements of <rule> (except for the <nest> element)   5
style style_definition An inline style definition 4 5
tabindex number Sets the tab order of an element 4 5
template url or elementID Refers to another document / another part of the document that should be applied to this element   5
title tooltip_text  A text to display in a tool tip 4 5

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