background-blend-mode-computed.html (2316B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>Compositing and Blending Level 1: getComputedStyle().backgroundBlendMode</title> 6 <link rel="help" href="https://drafts.fxtf.org/compositing-1/#propdef-background-blend-mode"> 7 <meta name="assert" content="background-blend-mode computed value is as specified."> 8 <script src="/resources/testharness.js"></script> 9 <script src="/resources/testharnessreport.js"></script> 10 <script src="/css/support/computed-testcommon.js"></script> 11 </head> 12 <body> 13 <div id="target"></div> 14 <script> 15 test_computed_value("background-blend-mode", "normal"); 16 test_computed_value("background-blend-mode", "multiply"); 17 test_computed_value("background-blend-mode", "screen"); 18 test_computed_value("background-blend-mode", "overlay"); 19 test_computed_value("background-blend-mode", "darken"); 20 test_computed_value("background-blend-mode", "lighten"); 21 test_computed_value("background-blend-mode", "color-dodge"); 22 test_computed_value("background-blend-mode", "color-burn"); 23 test_computed_value("background-blend-mode", "hard-light"); 24 test_computed_value("background-blend-mode", "soft-light"); 25 test_computed_value("background-blend-mode", "difference"); 26 test_computed_value("background-blend-mode", "exclusion"); 27 test_computed_value("background-blend-mode", "hue"); 28 test_computed_value("background-blend-mode", "saturation"); 29 test_computed_value("background-blend-mode", "color"); 30 test_computed_value("background-blend-mode", "luminosity"); 31 32 // Per spec, excess values should not be used, 33 // BUT the computed style should be similar to the specified values. 34 // see https://drafts.fxtf.org/compositing-1/#background-blend-mode 35 // and https://drafts.csswg.org/css-backgrounds-3/#layering 36 // > The lists are matched up from the first value: excess values at the end are not used. 37 // but in https://drafts.csswg.org/css-values-4/#linked-properties 38 // it was decided that 39 // > The computed values of the coordinating list properties are not affected by such truncation or repetition. 40 // 41 // There is a distinction between specified values, used values, and computed values. 42 43 test_computed_value("background-blend-mode", "normal, luminosity"); 44 test_computed_value("background-blend-mode", "screen, overlay"); 45 test_computed_value("background-blend-mode", "color, saturation"); 46 </script> 47 </body> 48 </html>