| <!DOCTYPE html> |
| <title>The getRangeAt method</title> |
| <script src=/resources/testharness.js></script> |
| <script src=/resources/testharnessreport.js></script> |
| <link rel="help" href="https://w3c.github.io/selection-api/#dom-selection-getrangeat"> |
| <body> |
| <script> |
| const sel = getSelection(); |
| |
| test(function() { |
| var range = document.createRange(); |
| sel.addRange(range); |
| assert_throws_dom("INDEX_SIZE_ERR", function() { sel.getRangeAt(-1); }) |
| assert_throws_dom("INDEX_SIZE_ERR", function() { sel.getRangeAt(1); }) |
| }, "Only supports index 0"); |
| |
| test(() => { |
| sel.removeAllRanges(); |
| assert_throws_dom("INDEX_SIZE_ERR", () => sel.getRangeAt(0)) |
| }, "Throws when with no range"); |
| |
| test(() => { |
| sel.addRange(document.createRange()); |
| assert_equals(sel.getRangeAt(0), sel.getRangeAt(0)); |
| }, "Returns the same range object when with no selection change"); |
| |
| test(() => { |
| const range = sel.getRangeAt(0); |
| sel.collapse(document.body); |
| assert_not_equals(range, sel.getRangeAt(0)); |
| }, "Returns a different range object when with selection change"); |
| </script> |