end worker Interview Questions and Answers

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100 Interview Questions and Answers for Frontend Worker

  1. What is your experience with HTML, CSS, and JavaScript?

    • Answer: I have [Number] years of experience working with HTML, CSS, and JavaScript. I'm proficient in using HTML5 semantic elements, CSS preprocessors like Sass or Less, and modern JavaScript frameworks like React, Angular, or Vue.js (Specify which ones and your level of proficiency). I'm comfortable with responsive design principles and ensuring cross-browser compatibility. I'm also familiar with testing frameworks like Jest and Cypress. I can provide specific examples of projects where I utilized these skills.

  2. Explain the difference between inline, internal, and external stylesheets.

    • Answer: Inline styles are applied directly within HTML elements using the style attribute. Internal stylesheets are defined within the <style> tag within the <head> section of an HTML document. External stylesheets are linked to HTML documents using the <link> tag and are stored in separate .css files. External stylesheets are preferred for larger projects due to maintainability and reusability.

  3. What are semantic HTML5 elements and why are they important?

    • Answer: Semantic HTML5 elements like <header>, <nav>, <article>, <aside>, <footer>, and <section> provide meaning to the content they enclose. They improve website accessibility for screen readers and assistive technologies, enhance SEO by providing context to search engines, and make the HTML code more readable and maintainable.

  4. Explain the box model in CSS.

    • Answer: The CSS box model describes how an element's content, padding, border, and margin combine to determine its overall size and position. Understanding the box model is crucial for controlling the layout and spacing of elements on a webpage.

  5. What is the difference between `position: relative` and `position: absolute`?

    • Answer: `position: relative` positions an element relative to its normal position. `position: absolute` removes the element from the document flow and positions it relative to its nearest positioned ancestor (or the initial containing block if no positioned ancestor exists).

  6. What are flexbox and grid layout in CSS? When would you use each?

    • Answer: Flexbox is ideal for one-dimensional layouts (either a row or a column), making it great for aligning items within a container. Grid layout is best for two-dimensional layouts, allowing you to create complex page structures with rows and columns. I'd use flexbox for simpler layouts like navigation menus or card components, and grid for more complex page layouts.

  7. Explain the difference between `==` and `===` in JavaScript.

    • Answer: `==` performs loose equality comparison, while `===` performs strict equality comparison. Loose equality will perform type coercion if necessary, while strict equality will only return true if both the value and type are the same.

  8. What are closures in JavaScript?

    • Answer: A closure is a function that has access to variables from its surrounding lexical environment, even after that environment has finished executing. This allows functions to "remember" their context.

  9. What is the difference between `let`, `const`, and `var` in JavaScript?

    • Answer: `var` has function scope, while `let` and `const` have block scope. `const` declares a constant value that cannot be reassigned, while `let` allows reassignment.

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