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The drop() method of Iterator instances returns a new iterator helper that skips the given number of elements at the start of this iterator.

The every() method of Iterator instances is similar to Array.prototype.every(): it tests whether all elements produced by the iterator pass the test implemented by the provided function. It returns a boolean value.

SVG is an XML language, similar to XHTML, which can be used to draw vector graphics, such as the one shown below. It can be used to create an image either by specifying all the lines and shapes necessary, by modifying already existing raster images, or by a combination of both. The image and its components can also be transformed, composited together, or filtered to change their appearance completely.

The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value.

A WeakRef object lets you hold a weak reference to another object, without preventing that object from getting garbage-collected.

The Intl namespace object contains several constructors as well as functionality common to the internationalization constructors and other language sensitive functions. Collectively, they comprise the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, date and time formatting, and more.

There are situations where basic shapes do not provide the flexibility you need to achieve a certain effect. Drop shadows, to provide a popular example, cannot be created reasonably with a combination of gradients. Filters are SVG's mechanism to create sophisticated effects.