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This is a recreation of the Tufte CSS homepage in org-mode using ox-tufte. The org file that generated this page is available here.
Tufte CSS provides tools to style web articles using the ideas demonstrated by Edward Tufte’s books and handouts. Tufte’s style is known for its simplicity, extensive use of sidenotes, tight integration of graphics with text, and carefully chosen typography.
Tufte CSS was created by Dave Liepmann and is now an Edward Tufte project. The original idea was cribbed from Tufte-\(\LaTeX\) and R Markdown’s Tufte Handout format. We give hearty thanks to all the people who have contributed to those projects.
If you see anything that Tufte CSS could improve, we welcome your contribution in the form of an issue or pull request on the GitHub project: tufte-css. Please note the contribution guidelines.
Finally, a reminder about the goal of this project. The web is not print. Webpages are not books. Therefore, the goal of Tufte CSS is not to say “websites should look like this interpretation of Tufte’s books” but rather “here are some techniques Tufte developed that we’ve found useful in print; maybe you can find a way to make them useful on the web”. Tufte CSS is merely a sketch of one way to implement this particular set of ideas. It should be a starting point, not a design goal, because any project should present their information as best suits their particular circumstances.
To use Tufte CSS, copy
tufte.css and the
et-book directory of font files to your project directory, then add the following to your HTML document’s
<link rel="stylesheet" href="tufte.css" />
Now you just have to use the provided CSS rules, and the Tufte CSS conventions described in this document. For best results, View Source and Inspect Element frequently.
Sections and Headings
Organise your document with an
article element inside your
body tag. Inside that, use
section tags around each logical grouping of text and headings.
Tufte CSS uses
h1 for the document title,
p with class
subtitle for the document subtitle,
h2 for section headings, and
h3 for low-level headings. More specific headings are not supported. If you feel the urge to reach for a heading of level 4 or greater, consider redesigning your document:
[It is] notable that the Feynman lectures (3 volumes) write about all of physics in 1800 pages, using only 2 levels of hierarchical headings: chapters and A-level heads in the text. It also uses the methodology of sentences which then cumulate sequentially into paragraphs, rather than the grunt of bullet points. Undergraduate Caltech physics is very complicated material, but it didn’t require an elaborate hierarchy to organise.
As a bonus, this excerpt regarding the use of headings provides an example of block quotes. In Tufte CSS they are just lightly styled, semantically correct HTML using
footer elements. See page 20 of the The Visual Display of Quantitative Information for an example in print.
In his later booksBeautiful Evidence, Tufte starts each section with a bit of vertical space, a non-indented paragraph, and the first few words of the sentence set in small caps. For this we use a span with the class
newthought, as demonstrated at the beginning of this paragraph. Vertical spacing is accomplished separately through
<section> tags. Be consistent: though we do so in this paragraph for the purpose of demonstration, do not alternate use of header elements and the
newthought technique. Pick one approach and stick to it.
Although paper handouts obviously have a pure white background, the web is better served by the use of slightly off-white and off-black colours. Tufte CSS uses
#111111 because they are nearly indistinguishable from their ’pure’ cousins, but dial down the harsh contrast. We stick to the greyscale for text, reserving colour for specific, careful use in figures and images.
In print, Tufte has used the proprietary Monotype BemboSee Tufte’s comment in the Tufte book fonts thread.. A similar effect is achieved in digital formats with the now open-source ETBook, which Tufte CSS supplies with a
@font-face reference to the
.ttf file. In case ETBook somehow doesn’t work, Tufte CSS shifts gracefully to other serif fonts like Palatino and Georgia.
Also notice how Tufte CSS includes separate font files for bold (strong) and italic (emphasis), instead of relying on the browser to mechanically transform the text. This is typographic best practice.
If you prefer sans-serif, use the
sans class. It relies on Gill Sans, Tufte’s sans-serif font of choice.
Links in Tufte CSS match the body text in colour and do not change on mouseover or when clicked. Here is a dummy example that goes nowhere. These links are underlined, since this is the most widely recognised indicator of clickable text. Blue text, while also a widely recognisable clickable-text indicator, is crass and distracting. Luckily, it is also rendered unnecessary by the use of underlining. However, because most browsers’ default underlining does not clear descenders and is so thick and distracting, the underline effect is instead achieved using CSS trickery involving background gradients instead of the standard
text-decoration. Credit goes to Adam Schwartz for that technique.
As always, these design choices are merely one approach that Tufte CSS provides by default. Other approaches can be made to work. The goal is to make sentences readable without interference from links, as well as to make links immediately identifiable even by casual web users.
Note, each of these
blockquotes has their own
div rather than sharing a common epigraph
The English language… becomes ugly and inaccurate because our thoughts are foolish, but the slovenliness of our language makes it easier for us to have foolish thoughts.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
I do not paint things, I paint only the differences between things.
If you’d like to introduce your page or a section of your page with some quotes, use epigraphs. Modelled after chapter epigraphs on Tufte’s books (particularly Beautiful Evidence), these are
blockquote elements with a bit of specialised styling. Quoted text is italicised. The source goes in a
footer element inside the
blockquote. We have provided three examples in the epigraph of this section, demonstrating shorter and longer quotes, with and without a paragraph tag, and showing how multiple quotes within an epigraph fit together with the use of a wrapper class.
Sidenotes: Footnotes and Marginal Notes
One of the most distinctive features of Tufte’s style is his extensive use of sidenotes.This is a sidenote. Sidenotes are like footnotes, except they don’t force the reader to jump their eye to the bottom of the page, but instead display off to the side in the margin. Perhaps you have noticed their use in this document already. You are very astute.
Sidenotes are a great example of the web not being like print. On sufficiently large viewports, Tufte CSS uses the margin for sidenotes, margin notes, and small figures. On smaller viewports, elements that would go in the margin are hidden until the user toggles them into view. The goal is to present related but not necessary information such as asides or citations as close as possible to the text that references them. At the same time, this secondary information should stay out of the way of the ye, not interfering with the progression of ideas in the main text.
Sidenotes consist of two elements: a superscript reference number that goes inline with the text, and a sidenote with content. To add the former, just pu a label and dummy checkbox into the text where you want the reference to go, like so:
<label for="sn-demo" class="margin-toggle sidenote-number"></label> <input type="checkbox" id="sn-demo" class="margin-toggle" />
You must manually assign a reference
id to each side or margin note, replacing “sn-demo” in the
for and the
id attribute values with an appropriate descriptor. It is useful to use prefixes like
sn- for sidenotes and
mn- for margin notes.
Immediately adjacent to that sidenote reference in the main text goes the sidenote content itself, in a
span with class
sidenote. This tag is also inserted directly in the middle of the body text, but is either pushed into the margin or hidden by default. Make sure to position your sidenotes correctly by keeping the
sidenote-number label close to the sidenote itself.
If you want a sidenote without footnote-style numberings, then you want a margin note. This is a margin note. Notice there isn’t a number preceding the note. On large screens, a margin note is just a sidenote that omits the reference number. This lessens the distracting effect taking away from the flow of the main text, but can increase the cognitive load of matching a margin note to its referent text. However, on small screens, a margin note is like a sidenote except its viewability-toggle is a symbol rather than a reference number. This document currently uses the symbol ⊕ (
⊕), but it’s up to you.
Margin notes are created just like sidenotes, but with the
marginnote class for the content and the
margin-toggle class for the label and dummy checkbox. For instance, here is the code for the margin note used in the previous paragraph:
<label for="mn-demo" class="margin-toggle">Ⅹ</label> <input type="checkbox" id="mn-demo" class="margin-toggle"/> <span class="marginnote"> This is a margin note. Notice there isn't a number preceding the note. </span>
Figures in the margin are created as margin notes, as demonstrated in the next section.
Tufte emphasises tight integration of graphics with text. Data, graphs, and figures are kept with the text that discusses them. In print, this means they are not relegated to a spearate page. On the web, that means readability of graphics and their accompanying text without extra clicks, tab-switching, or scrolling.
Figures should try to use the
figure element, which by default are constrained to the main column. Don’t wrap figures in a paragraph tag. Any label or margin note goes in a regular margin note inside the figure. For example, most of the time one should introduce a figure directly into the main flow of discussion, like so:
F.J. Cole, "The History of Albrecht Dürer’s Rhinoceros in Zoological Literature," Science, Medicine, and History: Essays on the Evolution of Scientific Thought and Medical Practice (London, 1953), ed. E. Ashworth Underwood, 337-356. From page 71 of Edward Tufte's Visual Explanations.
But tight integration of graphics with text is central to Tufte's work even when those graphics are ancillary to the main body of a text. In many of those cases, a margin figure may be most appropriate. To place figures in the margin, just wrap an image (or whatever) in a margin note inside a
p tag, as seen to the right of this paragraph.
If you need a full-width figure, give it the
fullwidth class. Make sure that’s inside an
article, and it will take up (almost) the full width of the screen. This approach is demonstrated using Edward Tufte’s English translation of the Napoleon’s March data visualisation. From Beautiful Evidence, page 122-124.
One obstacle to creating elegant figures on the web is the difficulty of handling different screen sizes, especially on the fly. Embedded
iframe elements are particularly troublesome. For these instances we provide a helper class,
iframe-wrapper, the most common use for which is probably YouTube videos, e.g.,
<figure class="iframe-wrapper"> <iframe width="853" height="480" src="https://www.youtube.com/embed/YslQ2625TR4" frameborder="0" allowfullscreen></iframe> </figure>
You can use this class on a
div instead of a
figure, with slightly different results but the same general effect. Experiment and choose depending on your application.
Technical jargon, programming language terms, and code samples are denoted with the
code class, as I’ve been sing in this document to denote HTML. Code needs to be monospace for formatting purposes and to aid in code analysis, but it must maintain its readability. To those ends, Tufte CSS follows GitHub’s font selection, which shifts gracefully along the monospace spectrum from the elegant but rare Consolas all the way to goold old reliable Courier.
Extended code examples should live in a
code element within a
pre element. This adds control over indentation and overflow as well:
(define (fact n) (if (= n 1) 1 (* n (fact (1- n)))))
Many thanks go to Edward Tufte for leading the way with his work. It is only through his kind and careful editing that this project accomplishes what it does. All errors of implementation are of course mine.