| Index: src/site/_includes/library-tour/html-websockets.markdown
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| diff --git a/src/site/_includes/library-tour/html-websockets.markdown b/src/site/_includes/library-tour/html-websockets.markdown
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| index c794f35f3a77442392c6b91cfc73ac30b363ba43..5c356bcb2fd7fafa2c4c6c51a0d70a91f6f04071 100644
 | 
| --- a/src/site/_includes/library-tour/html-websockets.markdown
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| +++ b/src/site/_includes/library-tour/html-websockets.markdown
 | 
| @@ -77,7 +77,7 @@ connectToWebSocket([int retrySeconds = 2]) {
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|    webSocket = new WebSocket(url);
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|  
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|    webSocket.on.message.add((e) {
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| -    receivedMessage(e.data);
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| +    receivedMessage((e as MessageEvent).data);
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|    });
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|  
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|    webSocket.on.open.add((e) {
 | 
| 
 |