test_grid_equality.html (1561B)
1 <!doctype html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script> 6 <link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css" /> 7 <style> 8 #grid { 9 display: grid; 10 width: 100px; 11 height: 100px; 12 } 13 14 .cellOriginal { 15 grid-column-end: span 2; 16 } 17 18 .cellChanged { 19 grid-column-end: span 5; 20 } 21 </style> 22 <script> 23 "use strict"; 24 25 SimpleTest.waitForExplicitFinish(); 26 27 function runTests() { 28 const grid = document.getElementById("grid"); 29 const cell = document.getElementById("cell"); 30 31 const gridA = grid.getGridFragments()[0]; 32 33 // Check that grid fragments are equal across reflows. 34 document.documentElement.offsetHeight; // Flush layout. 35 const gridB = grid.getGridFragments()[0]; 36 is(gridB, gridA, "Grid fragments should be the same across reflows."); 37 38 // Check that grid fragments are different when styles are different. 39 cell.classList.replace("cellOriginal", "cellChanged"); 40 const gridC = grid.getGridFragments()[0]; 41 isnot(gridC, gridA, "Grids with different styles should have different fragments."); 42 43 // Check that changing a grid to a matching style results in different fragments. 44 cell.classList.replace("cellChanged", "cellOriginal"); 45 const gridD = grid.getGridFragments()[0]; 46 isnot(gridD, gridA, "Grids changed to the same styles should have different fragments."); 47 48 SimpleTest.finish(); 49 } 50 </script> 51 </head> 52 <body onLoad="runTests();"> 53 <div id="grid"> 54 <div id="cell" class="cellOriginal"></div> 55 </div> 56 </body> 57 </html>