Typesetting in a grid
Besides full horizontal justification, LaTeX also adjusts the page content vertically to get a consistent page height. So, internal spacing is often variable. Furthermore, implicit spaces are often independent of the baseline height.
Consequently, lines of adjacent pages may look shifted. For two-sided prints with very thin paper, matching base lines would look much better. Especially in two-column documents it may be desirable to have baselines of adjacent lines at exactly the same height.
In this recipe, we would like to arrange lines on a grid. Normal text lines will be placed at a baseline grid. Displayed formulas, figures, tables, and captions are allowed to have a different baseline, but the following text should return ...
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