HTML (Document markup language) 3 Cascading style sheets 2 Design 2 Web sites 2 Authoring programs 1 Computer software 1 Development 1 Internet programming 1 Java (Computer program language) 1 JavaScript (Computer program language) 1 Object-oriented methods (Computer science) 1 Object-oriented programming (Computer science) 1 Object-oriented programming languages 1 Python (Computer program language) 1 Software patterns 1 Web site development 1