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.
font-sizecomputes to 16px.
The canvas background is
The initial value of
The user stylesheet is empty (except where indicated by the tests).
The device is interactive and uses scroll bars.
divelement is assigned
display: block;, the
unicode-bidiproperty may be declared, and no other property declarations.
spanelement is assigned
display: inline;and no other property declaration.
pelement is assigned
lielement is assigned
tdare assigned the
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.