| <!doctype html> |
| <title>round() function</title> |
| <meta charset=utf-8> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../support/numeric-testcommon.js"></script> |
| |
| <meta name=author content="Tab Atkins-Bittner"> |
| <link rel=help href="https://drafts.csswg.org/css-values-4/#round-func"> |
| |
| <div id=target></div> |
| <script> |
| // No-op round should be same as nearest |
| test_math_used("round(23px, 10px)", "20px"); |
| test_math_used("round(18px, 10px)", "20px"); |
| test_math_used("round(15px, 10px)", "20px"); |
| test_math_used("round(13px, 10px)", "10px"); |
| test_math_used("round(-13px, 10px)", "-10px"); |
| test_math_used("round(-18px, 10px)", "-20px"); |
| |
| // Test nearest |
| test_math_used("round(nearest, 23px, 10px)", "20px"); |
| test_math_used("round(nearest, 18px, 10px)", "20px"); |
| test_math_used("round(nearest, 15px, 10px)", "20px"); |
| test_math_used("round(nearest, 13px, 10px)", "10px"); |
| test_math_used("round(nearest, -13px, 10px)", "-10px"); |
| test_math_used("round(nearest, -18px, 10px)", "-20px"); |
| |
| // Test down |
| test_math_used("round(down, 23px, 10px)", "20px"); |
| test_math_used("round(down, 18px, 10px)", "10px"); |
| test_math_used("round(down, 15px, 10px)", "10px"); |
| test_math_used("round(down, 13px, 10px)", "10px"); |
| test_math_used("round(down, -13px, 10px)", "-20px"); |
| test_math_used("round(down, -18px, 10px)", "-20px"); |
| |
| // Test up |
| test_math_used("round(up, 23px, 10px)", "30px"); |
| test_math_used("round(up, 18px, 10px)", "20px"); |
| test_math_used("round(up, 15px, 10px)", "20px"); |
| test_math_used("round(up, 13px, 10px)", "20px"); |
| test_math_used("round(up, -13px, 10px)", "-10px"); |
| test_math_used("round(up, -18px, 10px)", "-10px"); |
| |
| // Test to-zero |
| test_math_used("round(to-zero, 23px, 10px)", "20px"); |
| test_math_used("round(to-zero, 18px, 10px)", "10px"); |
| test_math_used("round(to-zero, 15px, 10px)", "10px"); |
| test_math_used("round(to-zero, 13px, 10px)", "10px"); |
| test_math_used("round(to-zero, -13px, 10px)", "-10px"); |
| test_math_used("round(to-zero, -18px, 10px)", "-10px"); |
| |
| // Test a negative step |
| test_math_used("round(23px, -10px)", "20px"); |
| test_math_used("round(18px, -10px)", "20px"); |
| test_math_used("round(15px, -10px)", "20px"); |
| test_math_used("round(13px, -10px)", "10px"); |
| test_math_used("round(-13px, -10px)", "-10px"); |
| test_math_used("round(-18px, -10px)", "-20px"); |
| |
| // Extreme cases: |
| |
| // 0 step is NaN |
| test_nan("round(5, 0)"); |
| // both infinite is NaN |
| test_nan("round(infinity, infinity)"); |
| test_nan("round(infinity, -infinity)"); |
| test_nan("round(-infinity, infinity)"); |
| test_nan("round(-infinity, -infinity)"); |
| |
| // infinite value with finite step is the same infinity |
| test_plus_infinity("round(infinity, 5)"); |
| test_plus_infinity("round(infinity, -5)"); |
| test_minus_infinity("round(-infinity, 5)"); |
| test_minus_infinity("round(-infinity, -5)"); |
| |
| // Finite value with infinite step depends on rounding strategy. |
| // 'nearest' and 'to-zero': pos and +0 go to +0, neg and -0 go to -0 |
| test_plus_zero("round(5, infinity)"); |
| test_plus_zero("round(5, -infinity)"); |
| test_minus_zero("round(-5, infinity)"); |
| test_minus_zero("round(-5, -infinity)"); |
| test_plus_zero("round(to-zero, 5, infinity)"); |
| test_plus_zero("round(to-zero, 5, -infinity)"); |
| test_minus_zero("round(to-zero, -5, infinity)"); |
| test_minus_zero("round(to-zero, -5, -infinity)"); |
| // 'up': pos goes to +inf, 0+ goes to 0+, else 0- |
| test_plus_infinity("round(up, 1, infinity)"); |
| test_plus_zero("round(up, 0, infinity)"); |
| test_minus_zero("round(up, -1 * 0, infinity"); |
| test_minus_zero("round(up, -1, infinity"); |
| // 'down': neg goes to -inf, -0 goes to -0, else 0+ |
| test_minus_infinity("round(down, -1, infinity)"); |
| test_minus_zero("round(down, -1 * 0, infinity)"); |
| test_plus_zero("round(down, 0, infinity)"); |
| test_plus_zero("round(down, 1, infinity)"); |
| </script> |
