| Index: third_party/WebKit/LayoutTests/external/wpt/referrer-policy/css-integration/README.md
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| diff --git a/third_party/WebKit/LayoutTests/external/wpt/referrer-policy/css-integration/README.md b/third_party/WebKit/LayoutTests/external/wpt/referrer-policy/css-integration/README.md
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| +++ b/third_party/WebKit/LayoutTests/external/wpt/referrer-policy/css-integration/README.md
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| +These tests exercise differnt ways to load an image, generated via
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| +```/referrer-policy/generic/subresource/image.py?id=<UUID>``` and later
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| +verify the headers used to request that image.
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| +
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| +Since there is no way to wait for a resource referenced from CSS to be loaded,
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| +all tests use ```step_timeout()``` to delay the verification step until
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| +after the image (hopefully) was loaded.
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| +
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| +Since there is also no way to retrieve headers (or other information) from
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| +images loaded via CSS, we store the headers with the given ```UUID``` as key
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| +on the server, and retrieve them later via an XHR to
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| +```/referrer-policy/generic/subresource/image.py?id=<UUID>&report-headers```.
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|