Q31. Is postMessages synchronous?
The postMessages are synchronous in IE8 browser but they are asynchronous in IE9 and all other modern browsers (i.e, IE9+, Firefox, Chrome, Safari).Due to this asynchrono...
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Q32. What is the difference between reflow and repaint?
A _repaint_ occurs when changes are made which affect the visibility of an element, but not its layout. Examples of this include outline, visibility, or background color....
Q33. What is the output of prepend additive operator on falsy values?
If you prepend the additive(+) operator on falsy values(null, undefined, NaN, false, ""), the falsy value converts to a number value zero. Let's display them on browser c...
Q34. How do you capture browser back button?
The `beforeunload` event is triggered when the window, the document and its resources are about to be unloaded. This event is helpful to warn users about losing the curre...
Q35. What is web speech API?
Web speech API is used to enable modern browsers recognize and synthesize speech(i.e, voice data into web apps). This API was introduced by W3C Community in the year 2012...
Q36. What is minimum timeout throttling?
Both browser and NodeJS javascript environments throttles with a minimum delay that is greater than 0ms. That means even though setting a delay of 0ms will not happen ins...
Q37. How do you implement zero timeout in modern browsers?
You can't use setTimeout(fn, 0) to execute the code immediately due to minimum delay of greater than 0ms. But you can use window.postMessage() to achieve this behavior.
Q38. What are different event loops?
In JavaScript, there are multiple event loops that can be used depending on the context of your application. The most common event loops are: 1. The Browser Event Loop 2....
Q39. What is the purpose of queueMicrotask?
The `queueMicrotask` function is used to schedule a microtask, which is a function that will be executed asynchronously in the microtask queue. The purpose of `queueMicro...
Q40. What is the difference between shim and polyfill?
A shim is a library that brings a new API to an older environment, using only the means of that environment. It isn't necessarily restricted to a web application. For exa...