Waiting for multiple simultaneous AJAX requests to be finished has become quite easy by using the concept of Promises. We change each AJAX call to return a Promise. Promises from all AJAX calls are then passed to the Promise.all() method to find when all Promises are resolved.

Date & time for a given IANA timezone (such as America/Chicago, Asia/Kolkata etc) can be found by using the Date.toLocaleString() method.

A Javascript object can be converted to an array using Object.keys(), Object.values() or Object.entries() methods.

This tutorial discusses two ways of removing a property from an object. The first way is using the delete operator, and the second way is object destructuring which is useful to remove multiple object properties in a single line of code.

Playing & pausing a CSS animation can be done by using the animation-play-state property. Completely restarting the animation can be done by first removing the animation and then applying it again.

Animation can be done on an element which is dynamically inserted to page using CSS animation property. This property allows to give an initial and the final state of an element, and perform an animation between those states.

The append() & prepend() methods can be used to insert HTML string inside a given element. Both methods parse given HTML string as text and create Text node.

While creating a custom element, it is perfectly fine to use an external stylesheet for defining the element's CSS.

The customElements.get() method can be used to check whether a given custom element has already been registered in the page..

The customElements.whenDefined() method can be used to know when a given custom element has been registered.

While creating a new custom element, it is not necessary to give a name to the defining class. The custom element can be created using an anonymous class also.

A custom element's tag name must contain a dash character. The name must start with a lowercase ASCII character, and cannot have an uppercase ASCII character anywhere.

A custom element is a new HTML element that we can create ourselves. This tutorial explains how to create a simple custom element.

We can detect whether an element has been removed DOM using the MutationObserver object. This provides the ability to observe for changes being made to the DOM tree.

We can detect if an element has been added to DOM using a MutationObserver object. This provides the ability to observe for changes being made to the DOM tree.

There is no direct method to find out the maximum resolution supported by the camera. Instead we can specify the required width & height using the ideal property to find the closest possible resolution.

Videos can be recorded from the user camera using MediaDevices & MediaRecorder APIs.

Canvas images can be uploaded to server-side as a data URL string, base64 string or as a file.

Photos can be captured from a camera using a combination of MediaDevices & Canvas Javascript APIs. Video frame of the camera stream can be captured as an image.

All instances of a given string can be replaced by using the replaceAll() method. This method newly added to Javascript is now supported in all modern browsers.