HTML5 is a cornerstone of web development, and understanding its features is crucial for any web developer. Here are the top 10 HTML5 interview questions along with their answers to help you prepare.
Q1. What are the three basic components of an HTML5 application?
1. jQuery, templates, and local storage
2. Document, object, and model
3. Tags, elements, and attributes
4. HTML, CSS, and JavaScript
Correct Answer – 4
Q2. What type of data can be stored in local storage?
1. Any type
2. Objects
3. Numbers
4. Strings
Correct Answer – 4
Q3. How many color stops can a gradient have?
1. One
2. Two
3. Three
4. Any number
Correct Answer – 4
Q4. What does a transition do?
1. Transitions CSS properties from one value to another
2. Transitions an element from one type into another
3. Transitions from one class to another
4. Transitions from one view to another
Correct Answer – 1
Q5. What happens if a browser doesn’t support one of the new HTML5 input types?
1. The input field is not displayed.
2. The field is displayed as a text field.
3. The field is set to read only.
4. The browser shows an error message.
Correct Answer – 2
Q6. What kind of element can custom data attributes be used on?
1. Only form input elements.
2. Only block level elements.
3. Only inline elements.
4. Any element.
Correct Answer – 4
Q7. What unit is used to define the angle when drawing arcs?
1. Degrees
2. Units
3. Radians
4. Arcs
Correct Answer – 3
Q8. What context method is used to draw a path to the canvas?
1. drawPath()
2. stroke()
3. draw()
4. endPath()
Correct Answer – 2
Q9. How are touch events different from mouse events?
1. Touch events can have any number of points
2. Touch events don’t have any points
3. Touch events don’t have a preventDefault() method
4. There is no difference
Correct Answer – 1
Q10. How many bytes per pixel are there in the canvas image data?
1. One
2. Three
3. Four
4. Eight
Correct Answer – 3
Q11. What audio type does the <audio> element support?
1. Ogg
2. MP3
3. Wav
4. All of the above
Correct Answer – 4
Q12. Which object do you attach keyboard events to?
1. window
2. document
3. div
4. audio
Correct Answer – 3
Q13. Which JavaScript function can be used to create a timer that fires at regular intervals until cleared?
1. setTimeout()
2. setRate()
3. setInterval()
4. wait()
Correct Answer – 1
Q14. Which attributes of a <progress> element control the percentage of the progress bar that is marked complete?
1. value and max
2. currentValue and maxValue
3. start and end
4. min and max
Correct Answer – 1
Q15. What jQuery method do you use to make an Ajax request?
1. ajax()
2. get()
3. post()
4. All of the above
Correct Answer – 4
Q16. When do you need to use JSONP to make an Ajax request?
1. When calling a web service
2. When making a request to another domain
3. When making a request to the same domain
4. When doing a POST request
Correct Answer – 2
Q17. How do you send data to a web worker?
1. You can’t send data to a worker.
2. Using the postMessage() method.
3. Using the sendData() method.
4. Using the sendMessage() method.
Correct Answer – 2
Q18. Which resource in the main thread does a web worker have access to?
1. The DOM.
2. The window object.
3. The document object.
4. None of the above.
Correct Answer – 4
Q19. What does a JavaScript compressor not do?
1. Zip your code up into a compressed file
2. Combine your JavaScript files into one file
3. Remove all white space and comments from JavaScript files
4. Rename local variables to the smallest name possible
Correct Answer – 1
Q20. When are resources updated in the application cache?
1. When a file changes on the server
2. When the manifest file changes
3. Resources are never updated
4. Every time the user starts the application
Correct Answer – 2
Understanding these HTML5 interview questions will give you a strong foundation for web development roles. Being able to articulate these concepts clearly will help you stand out in interviews and demonstrate your knowledge of modern web practices.
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