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firefox/testing/web-platform/tests/docs/writing-tests/assumptions.md
Daniel Baumann 5e9a113729
Adding upstream version 140.0. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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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.