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Web-Related Terms Beginning with A

Absolute Length Units

Absolute length units are fixed standards of measurement. In other words, the size of things expressed in any of the absolute length units will never change—regardless of the medium used to display them.

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Aggregator File (ES Module)

An aggregator file is a script used solely to import and re-export the items you've exported from other modules.

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Anchor (RegExp)

Regular expression's anchor operators assert the precise location in a string where you wish to find a RegExp pattern.

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Anchor (URL)

An anchor is a link to a specific part of the same file the URL references.

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AND Operator (JS)

The AND operator (&&) checks if all of its operands are true.

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Annotation

Annotations (markup) are notes that get added to texts. So, for instance, HTML is an annotation language developers use to describe a web document.

Some other popular markup languages are XML, Markdown, SVG, Keyhole, MathML, X3D, XHTML, and LaTeX.

Anonymous Function

An anonymous function is a function that has no name.

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apply()

apply() is one of JavaScript's built-in methods that you can use to reassign a specific method from one object to a different one.

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Argument (JS)

An argument is an optional value you may pass to a function's parameter through an invocator.

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arguments Object (JS)

An arguments object is an array-like object built-in to every non-arrow function.

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Arithmetic Expression (JS)

An arithmetic expression is a piece of code that expresses a numeric value.

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Array (JS)

An array object is an element used to bundle multiple unnamed values into a single item.

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Array Destructuring (JS)

Array destructuring is a unique technique you can use to copy an array's value into new variables neatly.

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Array-Like Object (JS)

An array-like object is an object that has only a few—not all—of the features of a regular JavaScript array.

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Arrow Function Expression (JS)

An arrow function expression is a shorthand way to write a function expression.

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Assertions (RegExp)

Regular expression's assertions operator asserts the precise location in a string where you wish to find a RegExp pattern.

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Assignment Expression (JS)

An assignment expression is any piece of code that assigns its evaluated value to a variable (or property).

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ASYNC (Asynchronous)

ASYNC (asynchronous) means "not synchronous".

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Asynchronous Callback

An asynchronous callback is a callback whose invocation occurs in the future.

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Asynchronous Event

An asynchronous event is a program that can happen at any convenient time.

An asynchronous event does not wait for another event to complete its processing before starting its own execution.

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Asynchronous Function

An asynchronous function is a function that runs in its own timing—without waiting for another function to finish its execution first.

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At Least One (RegExp)

Regular expression's at least one operator (+) specifies that you wish to find at least one consecutive occurrence of its preceding item.

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Audio Data

Audio data are the sound-recorded contents of a page, such as WAV, MP3, and AAC.

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