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<!doctype html>
<img width=100 height=100 srcset="file_persist_image.png" onerror="this.alt = location.href;" alt="FAIL">
<img width=100 height=100 srcset="file_persist_image.png 1x, file_persist_image.png 2x, file_persist_image.png 100w, file_persist_image_bad.png">