1. Dart
2. dart:html
3. Window
4. onPlay property

Window class

1. Properties
2. animationFrame
3. animationWorklet
4. applicationCache
5. audioWorklet
6. caches
7. closed
8. console
9. cookieStore
10. crypto
11. customElements
12. defaultStatus
13. defaultstatus
14. devicePixelRatio
15. document
16. external
17. history
18. indexedDB
19. innerHeight
20. innerWidth
21. isSecureContext
22. localStorage
23. location
24. locationbar
25. menubar
26. name
27. navigator
28. offscreenBuffering
29. onAbort
30. onAnimationEnd
31. onAnimationIteration
32. onAnimationStart
33. onBeforeUnload
34. onBlur
35. onCanPlay
36. onCanPlayThrough
37. onChange
38. onClick
39. onContentLoaded
40. onContextMenu
41. onDeviceMotion
42. onDeviceOrientation
43. onDoubleClick
44. onDrag
45. onDragEnd
46. onDragEnter
47. onDragLeave
48. onDragOver
49. onDragStart
50. onDrop
51. onDurationChange
52. onEmptied
53. onEnded
54. onError
55. onFocus
56. onHashChange
57. onInput
58. onInvalid
59. onKeyDown
60. onKeyPress
61. onKeyUp
62. onLoad
63. onLoadedData
64. onLoadedMetadata
65. onLoadStart
66. onMessage
67. onMouseDown
68. onMouseEnter
69. onMouseLeave
70. onMouseMove
71. onMouseOut
72. onMouseOver
73. onMouseUp
74. onMouseWheel
75. onOffline
76. onOnline
77. onPageHide
78. onPageShow
79. onPause
80. onPlay
81. onPlaying
82. onPopState
83. onProgress
84. onRateChange
85. onReset
86. onResize
87. onScroll
88. onSearch
89. onSeeked
90. onSeeking
91. onSelect
92. onStalled
93. onStorage
94. onSubmit
95. onSuspend
96. onTimeUpdate
97. onTouchCancel
98. onTouchEnd
99. onTouchMove
100. onTouchStart
101. onTransitionEnd
102. onUnload
103. onVolumeChange
104. onWaiting
105. onWheel
106. opener
107. orientation
108. origin
109. outerHeight
110. outerWidth
111. pageXOffset
112. pageYOffset
113. parent
114. performance
115. screen
116. screenLeft
117. screenTop
118. screenX
119. screenY
120. scrollbars
121. scrollX
122. scrollY
123. self
124. sessionStorage
125. speechSynthesis
126. status
127. statusbar
128. styleMedia
129. toolbar
130. top
131. visualViewport
132. window
133. hashCode
134. on
135. runtimeType
136. Methods
137. alert
138. atob
139. btoa
140. cancelAnimationFrame
141. cancelIdleCallback
142. close
143. confirm
144. fetch
145. find
146. getComputedStyleMap
147. getMatchedCssRules
148. getSelection
149. matchMedia
150. moveBy
151. moveTo
152. open
153. openDatabase
154. postMessage
155. print
156. requestAnimationFrame
157. requestFileSystem
158. requestIdleCallback
159. resizeBy
160. resizeTo
161. resolveLocalFileSystemUrl
162. scroll
163. scrollBy
164. scrollTo
165. stop
166. addEventListener
167. dispatchEvent
168. noSuchMethod
169. removeEventListener
170. toString
171. Operators
172. operator ==
173. Static properties
174. supportsPointConversions
175. Constants
176. animationEndEvent
177. animationIterationEvent
178. animationStartEvent
179. beforeUnloadEvent
180. contentLoadedEvent
181. deviceMotionEvent
182. deviceOrientationEvent
183. hashChangeEvent
184. loadStartEvent
185. messageEvent
186. offlineEvent
187. onlineEvent
188. pageHideEvent
189. pageShowEvent
190. PERSISTENT
191. popStateEvent
192. progressEvent
193. storageEvent
194. TEMPORARY
195. unloadEvent

Stream<Event> get onPlay => Element.playEvent.forTarget(this);