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The universal attributes are:
align(depricated) class id style title dir lang xml:lang

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All attributes are made up of two parts a name and a value :

• The name is the property of the element that you want to set. for example, the < a > element carries an attribute whose name is href , which you can use to indicate where the link should take you.
  
• The value is what you want the value of the property to be. For < a >, the value is URL of the site that the link should take you to, so the value of the href attribute can be http://www.google.com
  

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A tag is made up of a left and right angle bracket and letters and numbers between those brackets, whereas elements are the opening and closing tags plus anything between the two tags.

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The required alt attribute specifies an alternate text for an image, if the image cannot be displayed. The alt attribute provides alternative information for an image if a user for some reason cannot view it.