Drupal logo is displayed with out the dimensions like width and height My client raised an issue that when viewing the source the logo of my website does not have any attributes, but I saw many themes, and not all have those attributes.

How do I add these to the logo? Is it really required?
The width and height is not required when using the img tag, but you can add it by overriding the theme template for the page, aka page.tpl.php in the directory containing the theme for your site. Usually sites/.../themes/YOURTHEME