chromium/third_party/blink/web_tests/printing/block-width-relayout-shrink.html

<!DOCTYPE html>
<script>
if (window.testRunner)
    testRunner.setPrinting();
if (window.internals)
    internals.settings.setShouldPrintBackgrounds(true);
</script>
<style>
    @page { margin:0; }
    body { margin:0; }
</style>
<div style="width:50%; height:550px; background:hotpink;"></div>

<!-- This test assumes that the initial page width is less than 1100px, and
     that we are allowed to actually stretch it to 1100px after initial layout,
     when we have discovered the widest element. The following block will
     trigger zoom-out: -->
<div style="width:1100px; height:1px;"></div>