This is a testharness.js-based test.
Found 24 FAIL, 0 TIMEOUT, 0 NOTRUN.
[FAIL] WebTransportDatagramsWritable interface: existence and properties of interface object
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface object length
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface object name
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface: existence and properties of interface prototype object
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface: existence and properties of interface prototype object's "constructor" property
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface: existence and properties of interface prototype object's @@unscopables property
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface: attribute sendGroup
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramsWritable interface: attribute sendOrder
  assert_own_property: self does not have own property "WebTransportDatagramsWritable" expected property "WebTransportDatagramsWritable" missing
[FAIL] WebTransportDatagramDuplexStream interface: operation createWritable(optional WebTransportSendOptions)
  assert_own_property: interface prototype object missing non-static operation expected property "createWritable" missing
[FAIL] WebTransport interface: operation exportKeyingMaterial(BufferSource, BufferSource, unsigned long)
  assert_own_property: interface prototype object missing non-static operation expected property "exportKeyingMaterial" missing
[FAIL] WebTransport interface: attribute reliability
  assert_true: The prototype object must have a property "reliability" expected true got false
[FAIL] WebTransport interface: attribute supportsReliableOnly
  assert_own_property: The interface object must have a property "supportsReliableOnly" expected property "supportsReliableOnly" missing
[FAIL] WebTransport interface: webTransport must inherit property "exportKeyingMaterial(BufferSource, BufferSource, unsigned long)" with the proper type
  assert_inherits: property "exportKeyingMaterial" not found in prototype chain
[FAIL] WebTransport interface: calling exportKeyingMaterial(BufferSource, BufferSource, unsigned long) on webTransport with too few arguments must throw TypeError
  assert_inherits: property "exportKeyingMaterial" not found in prototype chain
[FAIL] WebTransport interface: webTransport must inherit property "reliability" with the proper type
  assert_inherits: property "reliability" not found in prototype chain
[FAIL] WebTransportSendStream interface: operation getWriter()
  assert_own_property: interface prototype object missing non-static operation expected property "getWriter" missing
[FAIL] WebTransportWriter interface: existence and properties of interface object
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface object length
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface object name
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface: existence and properties of interface prototype object
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface: existence and properties of interface prototype object's "constructor" property
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface: existence and properties of interface prototype object's @@unscopables property
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface: operation atomicWrite(optional any)
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
[FAIL] WebTransportWriter interface: operation commit()
  assert_own_property: self does not have own property "WebTransportWriter" expected property "WebTransportWriter" missing
Harness: the test ran to completion.