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Test Info:
<!doctype html>
<input type=text style="background-color: red; background-image: linear-gradient(red, blue);">
<script>
let input = SpecialPowers.wrap(document.querySelector("input"));
SpecialPowers.Cc["@mozilla.org/satchel/form-fill-controller;1"].getService(SpecialPowers.Ci.nsIFormFillController).markAsAutoCompletableField(input);
input.getBoundingClientRect(); // previewValue setter depends on the reframe posted by markAsAutoCompletableField() having being processed...
input.previewValue = "Autofill";
input.autofillState = "preview";
</script>