Test Assumptions
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 viewport dimensions of at least 800px by 600px.
- 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 HTML
div
element is assigned display: block;
, the unicode-bidi
property may be declared, and no other property declarations. - 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.