Style guide
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===========
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Key principle
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-------------
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Highlight.js themes are language agnostic.
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Instead of trying to make a *rich* set of highlightable classes look good in a
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handful of languages we have a *limited* set of classes that work for all
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languages.
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Hence, there are two important implications:
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* Highlight.js styles tend to be minimalistic.
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* It's not possible to exactly emulate themes from other highlighting engines.
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Defining a theme
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----------------
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A theme is a single CSS defining styles for class names listed in the
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:doc:`class reference </css-classes-reference>`. The general guideline is to
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style all available classes, however an author may deliberately choose to
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exclude some (for example, ``.attr`` is usually left unstyled).
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You are not required to invent a separate styling for every group of class
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names, it's perfectly okay to group them:
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::
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.hljs-string,
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.hljs-section,
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.hljs-selector-class,
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.hljs-template-variable,
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.hljs-deletion {
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color: #800;
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}
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Use as few or as many unique style combinations as you want.
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Typography and layout dos and don'ts
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------------------------------------
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Don't use:
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* non-standard borders/margin/paddings for the root container ``.hljs``
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* specific font faces
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* font size, line height and anything that affects position and size of
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characters within the container
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Okay to use:
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* colors (obviously!)
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* italic, bold, underlining, etc.
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* image backgrounds
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These may seem arbitrary at first but it's what has shown to make sense in
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practice.
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There's also a common set of rules that *has* to be defined for the root
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container verbatim:
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::
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.hljs {
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display: block;
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overflow-x: auto;
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padding: 0.5em;
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}
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``.subst``
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----------
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One important caveat: don't forget to style ``.subst``. It's used for parsed
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sections within strings and almost always should be reset to the default color:
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::
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.hljs,
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.hljs-subst {
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color: black;
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}
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Contributing
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------------
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You should include a comment at the top of the CSS file with attribution and
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other meta data if necessary. The format is free:
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::
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/*
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Fancy style (c) John Smith <email@domain.com>
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*/
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If you're a new contributor add yourself to the authors list in AUTHORS.en.txt
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Also update CHANGES.md with your contribution.
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Send your contribution as a pull request on GitHub.
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