chromium/third_party/blink/web_tests/http/tests/encoding/meta-switch-mid-parse.html

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if (window.testRunner)
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This test demonstrates that we don't buffer HTML documents looking for a meta
charset directive. Instead, we follow the HTML5 specification and switch
encoding mid-parse. The iframe below should alert two different encodings.
<iframe src="resources/pause-then-switch-encoding.cgi"></iframe>