Strut (typesetting)
In typesetting, a strut is an invisible character or element, used to ensure that a text has a minimum height and depth, even if no other elements are included.
For example, LaTeX and plain TeX
Donald E. Knuth. The TeXbook (Computers and Typesetting, Volume A). Reading, Massachusetts: Addison-Wesley, 1984. {{ISBN|0-201-13448-9}}, page 82.
provide the command
\strut
to insert a font size-specific strut. In LaTeX
Braams, J. and Carlisle, D. and Jeffrey, A. and Lamport, L. and Mittelbach, F. and Rowley, C. and Schöpf, R., The LaTeX2e Sources. 2009/09/24, pages 19 and 129. Available online as [http://www.tug.org/texlive/Contents/live/texmf-dist/doc/latex/base/source2e.pdf PDF] and [http://mirror.ctan.org/macros/latex/base/source2e.tex LaTeX source].
it has a height of 70% of the baseline skip (the distance between the baselines of two consecutive lines of text) and a depth of 30% of the baseline skip. It ensures that two vertical stacked boxes which include such a strut have the same distance as two normal consecutive lines. LaTeX also supports the creation of general struts using the command:
\rule[-depth]{0pt}{total height}
where \strut is equivalent in size to
References
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