Link to “Intent to Deprecate” threadhttps://groups.google.com/a/chromium.org/d/msg/blink-dev/1m47rW4w7dc/MOf_2kgb2wIJw
Remove the previously deprecated `URL` attribute on the WebSocket interface, which is an alias for the standard `url` attribute.
The uppercase attribute name dates from the earliest iterations of the WebSockets API proposal, circa 2009. By spec revisions in 2011 the API had switched to lowercase, and that was what standardized and implemented in other browsers.
Usage information from UseCounterhttps://www.chromestatus.com/metrics/feature/popularity#WebSocketURL
Entry on chromestatus.comhttps://www.chromestatus.com/features/6555138000945152
The uppercase attribute isn't supported in Opera 12.16 (Presto), Firefox Nightly and IE11, but per source inspection, the uppercase alias is still present in WebKit.
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