CSS Selector Specificity

To determine which CSS style in your style sheet will outrank the others you need to calculate the “Specificity” for each of the styles based on the selectors used to target the HTML element. To calculate use the following rules:

HTML Tag Selector: 1 point ( i.e. p, div, span )
CSS Class Selector: 10 points ( i.e. class=”redText” )
HTML ID Selector: 100 points ( i.e. id=”HeaderBox” )

Example Styles:

span { color:yellow; } => has a score of 1 = 1
#HeaderBox span {color:blue;} => has a score of 100+1 = 101
#HeaderBox .redText span { color:red; } => has a score of 100+10+1 = 111

Example HTML:

This text will be blue.

This text will be red.

This text will be yellow.

Published by

Tim Clark

Experienced Business Owner, Chief Information Officer, Vice President, Chief Software Architect, Application Architect, Project Manager, Software Developer, Senior Web Developer, Graphic Designer & 3D Modeler, University Instructor, University Program Chair, Academic Director. Specialties: Ruby, Ruby on Rails, JavaScript, JQuery, AJAX, Node.js, React.js, Angular.js, MySQL, PostgreSQL, MongoDB, SQL Server, Responsive Design, HTML5, XHTML, CSS3, C#, ASP.net, Project Management, System Design/Architecture, Web Design, Web Development, Adobe CS6 (Photoshop, Illustrator)

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