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diff --git a/layout/reftests/xul/generate-object-fit-xul-tests.sh b/layout/reftests/xul/generate-object-fit-xul-tests.sh
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+++ b/layout/reftests/xul/generate-object-fit-xul-tests.sh
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+#!/bin/bash
+#
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+#
+# Script to generate XUL <image> reftest files, from corresponding reftest
+# files that use <img>.
+#
+# This script expects to be run from this working directory:
+#  mozilla-central/layout/reftests/w3c-css/submitted/images3
+
+XUL_REFTEST_PATH="../../../xul"
+
+imageFileArr=("colors-16x8.png"            "colors-8x16.png"
+              "colors-16x8.svg"            "colors-8x16.svg"
+              "colors-16x8-noSize.svg"     "colors-8x16-noSize.svg"
+              "colors-16x8-parDefault.svg" "colors-8x16-parDefault.svg")
+numImageFiles=${#imageFileArr[@]}
+
+# Copy image files
+for ((i = 0; i < $numImageFiles; i++)); do
+  imageFileName=${imageFileArr[$i]}
+  imageDest=$XUL_REFTEST_PATH/$imageFileName
+
+  echo "Copying $imageDest."
+  hg cp support/$imageFileName $imageDest
+done
+
+# Add comment to reftest.list in dest directory:
+reftestListFileName="$XUL_REFTEST_PATH/reftest.list"
+echo "
+# Tests for XUL <image> with 'object-fit' & 'object-position':
+# These tests should be very similar to tests in our w3c-css/submitted/images3
+# reftest directory. They live here because they use XUL, and it
+# wouldn't be fair of us to make a W3C testsuite implicitly depend on XUL."\
+  >> $reftestListFileName
+
+# Loop across all object-fit tests that use <img> ("i" suffix):
+for origTestName in object-fit*i.html; do
+  newTestName=$(echo $origTestName |
+                sed "s/i.html/.xul/")
+
+  # Find the corresponding reference case:
+  referenceName=$(echo $origTestName |
+                  sed "s/i.html/-ref.html/")
+
+  # Generate reference file (dropping "support" subdir from image paths):
+  echo "Copying $referenceName to $XUL_REFTEST_PATH."
+  newReferenceFullPath=$XUL_REFTEST_PATH/$referenceName
+  hg cp $referenceName $newReferenceFullPath
+  sed -i "s,support/,," $newReferenceFullPath
+
+  # Generate testcase
+  # (converting <video poster="support/foo.png"> to <video src="foo.webm">):
+  echo "Generating $newTestName from $origTestName."
+  newTestFullPath=$XUL_REFTEST_PATH/$newTestName
+  hg cp $origTestName $newTestFullPath
+
+  # Replace doctype with XML decl:
+  sed -i "s/<!DOCTYPE html>/<?xml version=\"1.0\"?>/" $newTestFullPath
+
+  # Replace html tags with window tags:
+  sed -i "s,<html>,<window xmlns=\"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul\">," $newTestFullPath
+  sed -i "s,</html>,</window>," $newTestFullPath
+
+  # Delete a bunch of HTML (not XUL) / W3C-testsuite boilerplate:
+  sed -i "/head>/d" $newTestFullPath # Delete head open & close tags
+  sed -i "/body>/d" $newTestFullPath # Delete body open & close tags
+  sed -i "/<meta/d" $newTestFullPath # Delete meta charset tag
+  sed -i "/<title/d" $newTestFullPath # Delete title line
+  sed -i "/<link/d" $newTestFullPath # Delete link tags
+
+  # Add 4px to all sizes, since in XUL, sizes are for border-box
+  # instead of content-box.
+  sed -i "s/ 48px/ 52px/" $newTestFullPath
+  sed -i "s/ 32px/ 36px/" $newTestFullPath
+  sed -i "s/ 8px/ 12px/" $newTestFullPath
+
+  # Fix style open/close tags, and add 8px of padding on outer <window> to
+  # match our HTML reference case, and change style rule to target <image>:
+  sed -i "s,  <style type=\"text/css\">,\<style xmlns=\"http://www.w3.org/1999/xhtml\"><![CDATA[\n      window { padding: 8px; }," $newTestFullPath
+  sed -i "s,  </style>,]]></style>," $newTestFullPath
+  sed -i "s/img {/image {/" $newTestFullPath
+
+  sed -i "s,support/,," $newTestFullPath
+  sed -i "s,<img\(.*\)>,<image\1/>," $newTestFullPath
+  sed -i "s,  <!--,<hbox>\n    <!--," $newTestFullPath
+  sed -i "s,  <br>,</hbox>," $newTestFullPath
+
+  # Update reftest manifest:
+  echo "== $newTestName $referenceName" \
+    >> $reftestListFileName
+
+done