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roboto flexroboto serifmulishinterarchivogeoramavartaheebopublic sansmanropecatamaranassistantdosisoswaldroboto slabbittermanualedominepiazzollafaustinaloranewsreaderalegreyagrenze gotischcinzelimbuetruculentayanone kaffeesatzsairainconsolataplayfair displaykreonpetronacabinencode sansexoralewayjostcommissionerdancing scripthahmletyrsarasasource sans 3besleymurechobodoni modaibarra real novanoto serif displaysource serif 4STIX two textinter tightliterataspline sans mono

Source Sans 3

Weight range 200-900
Class = italics

Source Sans 3 (£12gIl&@%? fi fl)

Source Sans 3 (£12gIl&@%? fi fl)

Source Sans 3 (£12gIl&@%? fi fl)

Alan says, "Source Sans 3—good enough to be included on this page."

A real-time patho-physiological simulator with embedded ANNs (artificial neural networks). A work in progress.

This page (apart from the header and footer) is rendered using a single variable typeface - "Source Sans 3". Source Sans 3, as with all the fonts implemented on this page, is impressively clear at small sizes and keeps an attractive shape with decent kerning throughout the weight-range. Google will serve an equivalent range of non-variable fonts to those browsers that do not support variable-fonts. Source Sans 3 should be suitable for information-dense web pages containing multiple areas of formatted text: paragraphs, tables, etc. This paragraph is normal width at a weight of 400. This sentence has class "bold" causing a relative increase in weight. A full, print-friendly, font.
Numerals: vertical alignment & character spacing / kerning 1234567890
£1,111.11 |
£8,888.88 |

Some tiny text light LIGHT @ 300. Some small text MEDIUM-LIGHT @ 300. Some big text MEDIUM-LIGHT @ 300. Some big text MEDIUM@ 400. Some heavy text HEAVY @ 700. The heaviest weight available: HEAVIEST. JET5 And in italics. JET5

Varying width (---)

Some text goes in here (narrow)
Some text goes in here (wide)

OK, here's some experimentation with CSS for tables and interface elements. All light-on-dark for an extra challenge in legibility! (weight 300)

I guess the basic question is: can you do a professional-looking website using only a single variable font? (weight 600)

Top Left
Cell 1

Cell 2: 2px padding, tiny font & whole cell is clickable!
Cell 3. Let's pad this one to 8px, add a rounded border and some text—and see how well it works (all cell clickable).
Bottom Right
Class = small (font size)

Button 1
Button 2
  1. One
  2. Two

And the answer is definitely! And that website will be faster because of the reduced overall font-file size, bandwidth, and memory requirements.