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HTML Attributes

Attributes give an extra data regarding HTML elements
HTML element can contain Attributes
Attributes are always specified in the opening tag.
Attributes are available pair written like name="value"
The most common style are double quotes however single quotes style are also allowed.
Note Tip:When the attribute value itself contains quote in some rare situation,it's necesary to use single quotes:name='Florin "the winner" Bacu'
HTML tip:use Attributes name that are written in lowercase.
Attributes name and attributes values are case-insensitive
However the World Wide Web

Core Attributes

.In addition to element-type-specific attributes (such like the cite attribute used for blockquotes), the subsequent core attributes can also be applied across almost the entire vary of HML elements, with some exceptions wherever it's not relevant to the contents of that element.For instance the title attribute could also be used on all elements contained within the body of a document (and will be applied to the body element itself) however isn't relevant to the mass of elements found within the head of the document, e.g. base, script and (perhaps not surprisingly) the title elements. Similarly, dir may be a core attribute used for specifying the reading direction of text and is thus not valid for elements like application program, br, or param.
(W3C) recommends attributes/attribute values written in lowercase in their HTML4 recomandation.
Newer version of (X)HTML lowercase attributes will be demand.

HTML Global Attributes([5])

Attribute	Description
accesskey	Specifies a shortcut key to activate/focus an element
class	Specifies one or more classnames for an element (refers to a class in a style sheet)
contentedit able	Specifies whether the content of an element is editable or not
contextmenu	Specifies a context menu for an element. The context menu appears when a user right-clicks on the element
data-*	Used to store custom data private to the page or application
dir	Specifies the text direction for the content in an element
draggable	Specifies whether an element is draggable or not
dropzone	Specifies whether the dragged data is copied, moved, or linked, when dropped
hidden	Specifies that an element is not yet, or is no longer, relevant
id	Specifies a unique id for an element
lang	Specifies the language of the element's content
spellcheck	Specifies whether the element is to have its spelling and grammar checked or not
style	Specifies an inline CSS style for an element
tabindex	Specifies the tabbing order of an element
title	Specifies extra information about an element
translate	Specifies whether the content of an element should be translated or not

id

a unique identifier for this element in the document
class

classifies this element into one or more subtypes
dir

specifies the reading direction for text as left to right or right to left
style

specifies an inline style for this element
title

provides extra information about the element