What are the standard codes for web front-end?

In Web front-end development, there are some common standard coding specifications and best practices, such as "HTML standard code", "CSS standard code", "JavaScript standard code", "responsive design standards" and " Accessibility standards: 1. HTML standard code, use semantic tags, and correctly use elements such as titles, paragraphs, lists, etc.; 2. CSS standard code, use external CSS files or embedded style sheets, and avoid inline styles; 3. JS Standard code, use semantic naming of variables and functions, follow the camel case naming convention, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Web front-end development, there are some common standard coding specifications and best practices, as follows:

1. ##HTML standard code:
   Use semantic tags and use titles, paragraphs, lists and other elements correctly.
   • Follow good indentation and nesting conventions to keep your code readable.
   • Use double quotes to wrap attribute values ​​and use lowercase letters.
   • Ensure that the HTML document structure is properly closed to avoid redundant tags.
2. CSS standard code:
   Use external CSS files or inline style sheets and avoid inline styles.
   • Use meaningful names for selectors and avoid using selectors that are too specific.
   • Follow the cascading rules and write styles in order from general to specific.
   • Use concise style sheets to avoid redundant and repeated style definitions.
   • Use appropriate CSS layout methods, such as Flexbox or Grid.
3. JavaScript standard code:
   Use semantic naming of variables and functions and follow the camel case naming convention.
   • Use strict mode ('use strict') to improve code security and performance.
   • Avoid using global variables and try to limit variables to local scope.
   • Use appropriate data types and operators to avoid type conversion errors.
   • Write clear, readable code, using comments for necessary explanations and documentation.
4. Responsive design standards:
   Use media queries to adjust styles according to different device sizes.
   • Adopt a fluid layout or responsive grid system to enable the page to adapt to different screen sizes.
   • Optimize image resources and use appropriate image formats and compression methods.
   • Consider touch on mobile devices and make sure page elements are easy to click and swipe.
5. Accessibility Standards:
   Use meaningful titles and alt attributes to provide good document structure.
   • Ensure the page is keyboard accessible and provide appropriate focus indication.
   • Follow the Web Content Accessibility Guidelines (WCAG) to improve the accessibility of your website.

These standard coding specifications and best practices can improve the maintainability, readability and scalability of the code, while also helping to ensure user experience and cross-browser compatibility.

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