Here, are 12 main function of Front end developer

User Interface (UI) Design

User Interface (UI) Design

HTML/CSS Coding

HTML/CSS Coding

JavaScript Programming

Responsive Design

Cross-Browser Compatibility

Web Performance Optimization

Web Performance Optimization

Version Control/Git

Collaboration with Back-End Developer

User Experience (UX) Design

Testing and Debugging

Accessibility

Continuous Learning and Keeping Up with Trend