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Web Developer Interview Questions and Answers

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Ques 31. What is the role of the 'DOCTYPE' declaration in HTML?

The 'DOCTYPE' declaration defines the document type and version of HTML or XHTML, ensuring proper rendering in web browsers.

Example:

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Ques 32. Explain the concept of 'Promises' in JavaScript.

Promises are objects representing the eventual completion or failure of an asynchronous operation, allowing better handling of asynchronous code.

Example:

const fetchData = new Promise((resolve, reject) => {
  // asynchronous code
});

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Ques 33. What is the 'CSS Box Model'?

The CSS Box Model is a design and layout concept that consists of content, padding, border, and margin, defining the space around and within an HTML element.

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Ques 34. Explain the purpose of the 'data-*' attribute in HTML.

The 'data-*' attribute is used to store custom data private to the page or application, accessible by JavaScript and CSS.

Example:

User Profile

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Ques 35. What is the purpose of the 'async' attribute in a script tag?

The 'async' attribute in a script tag allows the script to be downloaded asynchronously, without blocking the HTML parsing, and then executed.

Example:

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