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tests/wpt/web-platform-tests/docs/css-naming.md

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+CSS tests require a specific naming convention. This is also a good,
+but not mandatory, style to use for other tests.
+
+## File Name
+
+The file name format is ```test-topic-###.ext``` where ```test-
+topic``` somewhat describes the test and ### is a zero-filled number
+used to keep the file names unique.
+
+**test-topic**
+
+A short identifier that describes the test. The test-topic should
+avoid conjunctions, articles, and prepositions. It is a file name,
+not an English phrase: it should be as concise as possible.
+
+Examples:
+```
+    margin-collapsing-###.ext
+    border-solid-###.ext
+    float-clear-###.ext
+```
+
+**###**
+
+This is a zero-filled number used to keep the file names unique when
+files have the same test-topic name.
+
+Note: The number format is limited to 999 cases. If you go over this
+number it is recommended that you reevaluate your test-topic name.
+
+For example, in the case of margin-collapsing there are multiple
+cases so each case could have the same test-topic but different
+numbers:
+
+```
+    margin-collapsing-001.xht
+    margin-collapsing-002.xht
+    margin-collapsing-003.xht
+```
+
+There may also be a letter affixed after the number, which can be
+used to indicate variants of a test.
+
+For example, ```float-wrap-001l.xht``` and ```float-wrap-001r.xht```
+might be left and right variants of a float test.
+
+If tests using both the unsuffixed number and the suffixed number
+exist, the suffixed tests must be subsets of the unsuffixed test.
+
+For example, if ```bidi-004``` and ```bidi-004a``` both exist,
+```bidi-004a``` must be a subset of ```bidi-004```.
+
+If the unsuffixed test is strictly the union of the suffixed tests,
+i.e. covers all aspects of the suffixed tests (such that a user agent
+passing the unsuffixed test will, by design, pass all the suffixed
+tests), then the unsuffixed test should be marked with the combo flag.
+
+If ```bidi-004a``` and ```bidi-004b``` cover all aspects of ```bidi-
+004``` (except their interaction), then bidi-004 should be given the
+combo flag.
+
+**ext**
+
+The file extension or format of the file, usually ```.xht``` for
+test files.