Update browser-features.md

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@ -6,10 +6,10 @@ The difference between the gRPC-Web
protocol and the HTTP/2 based gRPC protocol is specified in the core gRPC repo as [PROTOCOL-WEB](https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md).
In addition to the wire-transport spec, gRPC-Web also supports features that are unique to browser (HTML) clients.
This document is the official spec for those features. As the Web platform evolves,
This document serves as the official spec for those features. As the Web platform evolves,
we expect some of those features will evolve too or become deprecated.
On the server-side, [Envoy](https://www.envoyproxy.io/) is the official proxy with out-of-box gRPC-Web support. New features will be implemented in Envoy first. For [in-process gRPC-Web support](https://github.com/grpc/grpc-web/blob/master/doc/in-process-proxy.md), we recommend the gRPC-Web module implement only a minimum set of features, e.g. to enable local development. Those features are identified as mandatory features in this doc.
On the server-side, [Envoy](https://www.envoyproxy.io/) is the official proxy with built-in gRPC-Web support. New features will be implemented in Envoy first. For [in-process gRPC-Web support](https://github.com/grpc/grpc-web/blob/master/doc/in-process-proxy.md), we recommend that the gRPC-Web module implement only a minimum set of features, e.g. to enable local development. Those features are identified as mandatory features in this doc.
# CORS support