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Question-1. What is Less?
Answer-1: Less (Leaner Style Sheets) is a CSS preprocessor that extends CSS with dynamic behavior such as variables, nesting, mixins, and functions to make stylesheets more maintainable and reusable.
Question-2. How do you declare a variable in Less?
Answer-2: Variables in Less are declared using the @ symbol, e.g., @primary-color: #3498db;.
Question-3. What are mixins in Less?
Answer-3: Mixins are reusable blocks of code that can include CSS properties and even other mixins, e.g., .border-radius(@radius) { border-radius: @radius; }.
Question-4. How do you include a mixin in Less?
Answer-4: Include a mixin by calling its name like a class, e.g., .border-radius(10px);.
Question-5. What is nesting in Less?
Answer-5: Nesting in Less allows selectors to be nested within other selectors to reflect the hierarchy in the HTML structure, e.g., .parent { .child { color: red; } }.
Question-6. What are the benefits of using Less?
Answer-6: Benefits include variables, mixins, nesting, functions, and operations, which enhance code maintainability, reusability, and reduce duplication.
Question-7. How do you perform arithmetic operations in Less?
Answer-7: Use operators like +, -, *, /, and % to perform calculations, e.g., width: @base-width * 2;.
Question-8. How do you use functions in Less?
Answer-8: Less includes built-in functions for operations like color manipulation, string operations, and mathematical calculations, e.g., lighten(@color, 20%);.
Question-9. What is the difference between Less and Sass?
Answer-9: Less uses JavaScript and is processed on the client or server side, while Sass is Ruby-based and typically requires a preprocessor for compilation.
Question-10. How do you import files in Less?
Answer-10: Use the @import directive to include other Less files, e.g., @import "variables.less";.
Question-11. What are parametric mixins in Less?
Answer-11: Parametric mixins accept arguments to generate dynamic styles, e.g., .button(@color) { background: @color; }.
Question-12. How do you create a function in Less?
Answer-12: Use mixins or custom logic with parametric mixins to mimic function behavior, e.g., .set-margin(@size) { margin: @size; }.
Question-13. What are guards in Less?
Answer-13: Guards are conditional expressions used in mixins to define when certain styles should apply, e.g., .mixin(@size) when (@size > 10px) { font-size: @size; }.
Question-14. How do you use guards with mixins?
Answer-14: Add a condition using the when keyword, e.g., .mixin(@color) when (lightness(@color) > 50%) { color: darken(@color, 20%); }.
Question-15. What are operations in Less?
Answer-15: Operations in Less allow mathematical calculations directly in the stylesheet, e.g., width: 100% / 3;.
Question-16. How do you work with color functions in Less?
Answer-16: Use built-in functions like darken, lighten, saturate, etc., e.g., background: lighten(@color, 10%);.
Question-17. What is the purpose of & in Less?
Answer-17: The & symbol references the parent selector in nested rules, e.g., .button { &:hover { background: blue; } }.
Question-18. What is the default behavior of @import in Less?
Answer-18: The @import directive in Less includes the imported file's contents into the main stylesheet.
Question-19. What are the disadvantages of Less?
Answer-19: Disadvantages include dependency on a preprocessor and the potential to overcomplicate styles with too many nested rules or mixins.
Question-20. How do you comment in Less?
Answer-20: Use // for single-line comments or /* ... */ for multi-line comments.
Question-21. What are namespaces in Less?
Answer-21: Namespaces group related mixins and variables together, e.g., #namespace { .mixin { color: red; } }.
Question-22. How do you use a namespace in Less?
Answer-22: Access namespaced properties with the #namespace.mixin syntax, e.g., #namespace.mixin();.
Question-23. What is the difference between Less and plain CSS?
Answer-23: Less extends CSS by adding features like variables, nesting, mixins, and operations, which are not available in plain CSS.
Question-24. How do you extend a class in Less?
Answer-24: Use the :extend pseudo-class to extend styles, e.g., .new-class:extend(.existing-class);.
Question-25. How do you define a loop in Less?
Answer-25: Less uses recursive mixins to create loops, e.g., .loop(@i) when (@i > 0) { .item-@{i} { width: @i * 10px; } .loop(@i - 1); }.
Question-26. What are the file extensions used for Less files?
Answer-26: The standard file extension for Less files is .less.
Question-27. How do you compile Less to CSS?
Answer-27: Compile Less using tools like the lessc command-line tool or build tools like Webpack and Gulp.
Question-28. What is the role of the !important declaration in Less?
Answer-28: The !important declaration is used to give higher specificity to a style, similar to its role in CSS, e.g., color: red !important;.
Question-29. Can you write inline Less in an HTML file?
Answer-29: Yes, by using the
