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| -rw-r--r-- | testing/web-platform/tests/docs/writing-tests/assumptions.md | 40 |
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diff --git a/testing/web-platform/tests/docs/writing-tests/assumptions.md b/testing/web-platform/tests/docs/writing-tests/assumptions.md new file mode 100644 index 0000000000..5afa416121 --- /dev/null +++ b/testing/web-platform/tests/docs/writing-tests/assumptions.md @@ -0,0 +1,40 @@ +# 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 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 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. |