`. This improves the overall structure and understanding of the webpage.
How do you handle cross-browser compatibility issues in HTML5?
- Answer: Cross-browser compatibility is addressed through several strategies: using CSS resets or normalizers to standardize styling, employing feature detection (checking if the browser supports a feature before using it), using polyfills (providing a fallback for unsupported features), and thorough testing across major browsers and devices.
Describe the role of the `
- Answer: The `
What are the different input types available in HTML5?
- Answer: HTML5 introduces many new input types beyond the basic text input, including `email`, `url`, `tel`, `number`, `range`, `date`, `time`, `color`, `search`, `password`, `checkbox`, `radio`, `file`, etc. These provide improved user experience and server-side validation capabilities.
Explain the use of the `
- Answer: The `
How do you implement form validation in HTML5?
- Answer: HTML5 provides built-in form validation using attributes like `required`, `pattern`, `min`, `max`, `email`, etc. These attributes can enforce constraints on the input fields and provide immediate feedback to users. JavaScript can be used for more complex validation scenarios.
What is the purpose of the `placeholder` attribute?
- Answer: The `placeholder` attribute provides a hint to the user about what kind of information should be entered into a form field. The hint disappears when the user begins typing.
Explain the use of the `data-*` attributes.
- Answer: `data-*` attributes allow you to store custom data private to the page or application. This data can be accessed using JavaScript to enhance functionality without cluttering the HTML with more elements or classes.
How do you use the Geolocation API?
- Answer: The Geolocation API provides access to the user's geographical location. Using JavaScript, you can request the latitude and longitude coordinates. However, you must handle the situation where the user denies permission to access their location.
What are Web Workers and how are they used?
- Answer: Web Workers allow you to run JavaScript code in the background, separately from the main thread of the page. This prevents blocking the UI and improves responsiveness, especially with long-running calculations or tasks. They cannot directly manipulate the DOM.
Explain the difference between GET and POST requests.
- Answer: GET requests append data to the URL, while POST requests send data in the body of the HTTP request. GET requests are typically used for retrieving data, while POST requests are used for submitting data, often creating or updating resources on the server. GET requests are cacheable, while POST requests are not.
What is the role of the `DOCTYPE` declaration?
- Answer: The `DOCTYPE` declaration tells the browser which version of HTML the page is written in, enabling it to render the page correctly using the appropriate rendering mode (Standards mode or Quirks mode). It's crucial for consistent rendering across browsers.
How do you optimize HTML for SEO?
- Answer: SEO optimization involves using semantic HTML, adding relevant metadata (like ``, ``, etc.), structuring content logically with headers (`
` to ``), using alt text for images, creating sitemaps, and ensuring the site is mobile-friendly.
What is the difference between inline, internal, and external CSS?
- Answer: Inline CSS is applied directly within HTML elements using the `style` attribute. Internal CSS is defined within the `