Q1. How do you manipulate DOM using a service worker?
Service worker can't access the DOM directly. But it can communicate with the pages it controls by responding to messages sent via the `postMessage` interface, and those ...
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Q2. What are the restrictions of web workers on DOM?
WebWorkers don't have access to below javascript objects since they are defined in an external files 1. Window object 2. Document object 3. Parent object
Q3. What is event capturing?
Event capturing is a phase of event propagation in which an event is first intercepted by the outermost ancestor element, then travels downward through the DOM hierarchy ...
Q4. What is event bubbling?
Event bubbling is a type of event propagation in which an event first triggers on the innermost target element (the one the user interacted with), and then bubbles up thr...
Q5. What is the difference between document load and DOMContentLoaded events?
The `DOMContentLoaded` event is fired when the initial HTML document has been completely loaded and parsed, without waiting for assets(stylesheets, images, and subframes)...
Q6. What is the difference between an attribute and a property?
Attributes are defined on the HTML markup whereas properties are defined on the DOM. For example, the below HTML element has 2 attributes: `type` and `value`, ```javascri...
Q7. What is same-origin policy?
The same-origin policy is a policy that prevents JavaScript from making requests across domain boundaries. An origin is defined as a combination of URI scheme, hostname, ...
Q8. What are the steps involved in return false usage?
The return false statement in event handlers performs the below steps, 1. First it stops the browser's default action or behaviour. 2. It prevents the event from propagat...
Q9. How do you generate random integers?
You can use `Math.random()` with `Math.floor()` to return random integers. For example, if you want generate random integers between 1 to 10, the multiplication factor sh...
Q10. Can you write a random integers function to print integers within a range?
Yes, you can create a proper random function to return a random number between min and max (both included) ```javascript function randomInteger(min, max) { return Math.fl...