[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Network](./puppeteer.protocol.network.md) > [WebSocketFrame](./puppeteer.protocol.network.websocketframe.md) > [mask](./puppeteer.protocol.network.websocketframe.mask.md) ## Protocol.Network.WebSocketFrame.mask property WebSocket message mask. Signature: ```typescript mask: boolean; ```