[Webkit-unassigned] [Bug 209216] New: PerformanceObserver should work without the `entryTypes` options

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Mar 17 19:45:50 PDT 2020


https://bugs.webkit.org/show_bug.cgi?id=209216

            Bug ID: 209216
           Summary: PerformanceObserver should work without the
                    `entryTypes` options
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philip at philipwalton.com

** Steps to reproduce: **

1. Navigate to example.com (or any web page) in Safari and run the following code in the console:

```
new PerformanceObserver((list) => {
  for (const entry of list.getEntries()) {
    console.log(entry);
  }
}).observe({type: 'resource'});
```

2. Notice that the following error is thrown:

TypeError: Member PerformanceObserverInit.entryTypes is required and must be an instance of sequence


** What should happen: **

No error should be thrown if the `type` options is used instead of `entryTypes`.


** Justification: **

The WebIDL for PerformanceObseverInit [1] shows that it accepts either an `entryTypes` option OR a `type` option:

```
dictionary PerformanceObserverInit {
  sequence<DOMString> entryTypes;
  DOMString type;
  boolean buffered;
};
```

[1] https://w3c.github.io/performance-timeline/#dom-performanceobserverinit

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20200318/2b661a19/attachment.htm>


More information about the webkit-unassigned mailing list