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---
layout: page
title: Test Assumptions
order: 13
---
The tests make a number of assumptions of the user agent, and new
tests can freely rely on these assumptions being true:
* The device is a full-color device.
* The device has a viewport width of at least 800px.
* The UA imposes no minimum font size.
* The `medium` `font-size` computes to 16px.
* The canvas background is `white`.
* The initial value of `color` is `black`.
* The user stylesheet is empty (except where indicated by the tests).
* The device is interactive and uses scroll bars.
* The device has the Ahem font installed.
* The HTML `div` element is assigned `display: block;`, the
`unicode-bidi` property may be declared, and no other property
declarations.
<!-- unicode-bidi: isolate should be required; we currently don't
assume this because Chrome and Safari are yet to ship this: see
https://bugs.chromium.org/p/chromium/issues/detail?id=296863 and
https://bugs.webkit.org/show_bug.cgi?id=65617 -->
* The HTML `span` element is assigned `display: inline;` and no other
property declaration.
* The HTML `p` element is assigned `display: block;`
* The HTML `li` element is assigned `display: list-item;`
* The HTML `table` elements `table`, `tbody`, `tr`, and `td` are
assigned the `display` values `table`, `table-row-group`,
`table-row`, and `table-cell`, respectively.
* The UA implements reasonable line-breaking behavior; e.g., it is
assumed that spaces between alphanumeric characters provide line
breaking opportunities and that UAs will not break at every
opportunity, but only near the end of a line unless a line break is
forced.
Tests for printing behavior make some further assumptions:
* The UA is set to print background colors and, if it supports
graphics, background images.
* The UA implements reasonable page-breaking behavior; e.g., it is
assumed that UAs will not break at every opportunity, but only near
the end of a page unless a page break is forced.
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