Tab stop
Tab stop
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Tab stop

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Tab stop

A tab stop or tabulator position on a typewriter is a location where the carriage movement is halted by an adjustable end stop. Tab stops are set manually, and pressing the tab key causes the carriage to go to the next tab stop. In text editors on a computer, the same concept is implemented simplistically with automatic, fixed tab stops.

Modern word processors generalize this concept by offering tab stops that have an alignment attribute and cause the text to be automatically aligned at left, at right or center of the tab stop itself. Such tab stops are paragraph-specific properties and can be moved to a different location in any moment, or even removed.

Sometimes, placeholders in code snippets are also called "tab stops" because the user can cycle through them by pressing the tab key.

Many modern typewriters have tab stops. These can be either fixed, usually at 8 or 10 character intervals, or user-settable. There were many ways to set the tab stops, from very complicated to very simple and interactive.

The Olivetti Lettera 22 has a lever at left of the keyboard, that can be used to set (pull lever towards you) or unset (push lever away) a tab stop. This pushes a pin out (or in) on a metal bar at the underside of the carriage, that engages with the tab stop pawl.

A tab stop is a horizontal position which is set for placing and aligning text on a page. There are at least five kinds of tab stops in general usage in word processing or in Microsoft Word.

In contrast to fixed positioning, tab stops can be adjusted dynamically, based on the length of adjacent tab-delimited line segments, by alignment to a specific character or string in each line, etc. Adobe InDesign supports a non-printing "indent to here" character.

In 2006, Nick Gravgaard published an algorithm for automatic dynamic tab stops called "Elastic tabstops". This can be useful for viewing/editing source code and is naturally essential for tabular data. Various text editors and IDEs have implemented the elastic tabstops algorithm either directly or by extension.

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