test_compute_data_with_start_struct.html (3163B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test for correct handling of aStartStruct parameter to nsRuleNode::Compute*Data</title> 5 <script src="/tests/SimpleTest/SimpleTest.js"></script> 6 <script type="text/javascript" src="property_database.js"></script> 7 <style type="text/css" id="stylesheet"></style> 8 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> 9 </head> 10 <body> 11 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=216456">Mozilla Bug 216456</a> 12 <p id="display"> 13 <span id="base"></span> 14 <span id="test"></span> 15 </p> 16 <div id="content" style="display: none"> 17 18 </div> 19 <pre id="test"> 20 <script class="testbody" type="text/javascript"> 21 22 /** 23 * The purpose of this test was to test that in the old style system 24 * the nsRuleNode::Compute*Data functions were written correctly. 25 * In particular, in these functions, when the specified value of a 26 * property had unit eCSSUnit_Null, touching the computed data is 27 * forbidden. This is because we sometimes would stop walking up the 28 * rule tree when we find computed data for an initial subsequence of 29 * our rules (i.e., an ancestor rule node) that we can use as a starting 30 * point (aStartStruct) for the computation for the current rule node. 31 * 32 * However, we don't cache style structs in the rule tree in the current 33 * style system code, and property cascading no longer relies on hand 34 * written functions, so this particular failure mode isn't as likely to 35 * happen. 36 */ 37 38 var gStyleSheet = document.getElementById("stylesheet").sheet; 39 var gRule1 = gStyleSheet.cssRules[gStyleSheet.insertRule("#base, #test {}", gStyleSheet.cssRules.length)]; 40 var gRule2 = gStyleSheet.cssRules[gStyleSheet.insertRule("#test {}", gStyleSheet.cssRules.length)]; 41 42 var gBase = getComputedStyle(document.getElementById("base"), ""); 43 var gTest = getComputedStyle(document.getElementById("test"), ""); 44 45 function test_property(prop, lower_set, higher_set) { 46 var info = gCSSProperties[prop]; 47 if (info.subproperties || info.logical) 48 return; 49 50 gRule1.style.setProperty(prop, info[lower_set][0]); 51 gRule2.style.setProperty(prop, info[higher_set][0]); 52 53 if ("prerequisites" in info) { 54 for (var prereq in info.prerequisites) { 55 gRule2.style.setProperty(prereq, info.prerequisites[prereq], ""); 56 } 57 } 58 59 gBase.getPropertyValue(prop); 60 var higher_set_val = gTest.getPropertyValue(prop); 61 gRule2.style.setProperty(prop, info[lower_set][0], ""); 62 var lower_set_val = gTest.getPropertyValue(prop); 63 isnot(higher_set_val, lower_set_val, "initial and other values of " + prop + " are different"); 64 65 gRule2.style.removeProperty(prop); 66 is(gTest.getPropertyValue(prop), lower_set_val, prop + " is not touched when its value comes from aStartStruct"); 67 68 gRule1.style.removeProperty(prop); 69 if ("prerequisites" in info) { 70 for (var prereq in info.prerequisites) { 71 gRule2.style.removeProperty(prereq); 72 } 73 } 74 } 75 76 function round(lower_set, higher_set) { 77 for (var prop in gCSSProperties) 78 test_property(prop, lower_set, higher_set); 79 } 80 81 round("other_values", "initial_values"); 82 round("initial_values", "other_values"); 83 84 </script> 85 </pre> 86 </body> 87 </html>