Script (lit-element) error , not close jsx param.

[bitrix1]

https://github.com/webrtc/samples/blame/7917d9ec954f5c6d8ca6f10cafe1f1772db8d533/src/content/datachannel/messaging/main.js#L120

Need add "

<button disabled="${!connected}" on-click="${() => this._sendMessage(this.localOutgoing, this._localChannel)} 

on-click="${() => this._sendMessage(this.localOutgoing, this._localChannel)}"