| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <link rel=help href="https://drafts.csswg.org/css-scroll-snap-2/#snapevent-interface"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <script> |
| test(function() { |
| assert_throws_js(TypeError, function() { |
| new SnapEvent(); |
| }, 'First argument (type) is required, so was expecting a TypeError.'); |
| }, 'Missing type argument'); |
| |
| test(function() { |
| let event = new SnapEvent(""); |
| assert_true(event instanceof window.SnapEvent); |
| }, "the event is an instance of SnapEvent"); |
| |
| test(function() { |
| let event = new SnapEvent("customsnapevent"); |
| assert_equals(event.type, "customsnapevent", |
| "event constructor type is honored"); |
| assert_equals(event.snapTargetBlock, null, "null snapTrgetBlock"); |
| assert_equals(event.snapTargetInline, null, "null snapTargetInline"); |
| }, "default init dict"); |
| |
| test(function() { |
| const div_element = document.createElement("div"); |
| let event = new SnapEvent("scrollsnapchange", { |
| snapTargetBlock: document, |
| snapTargetInline: div_element |
| }); |
| assert_equals(event.type, "scrollsnapchange"); |
| assert_equals(event.snapTargetBlock, document); |
| assert_equals(event.snapTargetInline, div_element); |
| }, "event constructor type is honored"); |
| </script> |
| </body> |
| </html> |
