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diff --git a/layout/reftests/w3c-css/submitted/images3/support/generate-object-fit-png-tests.sh b/layout/reftests/w3c-css/submitted/images3/support/generate-object-fit-png-tests.sh
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+++ b/layout/reftests/w3c-css/submitted/images3/support/generate-object-fit-png-tests.sh
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+#!/bin/bash
+#
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+#
+# This is a script that I used to generate a suite of tests for the CSS
+# properties "object-fit" and "object-position", using a template testcase
+# file and reference case file.
+#
+# The reference case uses the "background-size" & "background-position"
+# equivalent of the tested "object-fit" / "object-position" values.
+# (One exception: since there is no "background-size" equivalent of
+# "object-fit: scale-down", we add an extra CSS rule for the "scale-down"
+# reference cases -- see REPLACEME_SCALE_DOWN_EXTRA_RULE below.)
+
+FILE_PATH="./"
+REFTEST_LIST_FILE="$FILE_PATH/reftest.list"
+
+TEMPLATE_TESTCASE_FILENAME=$FILE_PATH/support/template-object-fit-test.html
+TEMPLATE_REFERENCE_FILENAME=$FILE_PATH/support/template-object-fit-ref.html
+
+imageFileFormat="png"
+
+# Array of image files to use for testing:
+imageFileArr=("support/colors-16x8.png" "support/colors-8x16.png")
+numImageFiles=${#imageFileArr[@]}
+
+# Array of "object-fit" values, & of corresponding "background-size" values.
+# (Note: background-size has no equivalent for "object-fit: scale-down". We use
+# "auto auto" here, which is equivalent *some* of the time; and for the cases
+# where it's *not* equivalent, we use an extra CSS rule in the reference case.
+# See REPLACEME_SCALE_DOWN_EXTRA_RULE below.)
+objectFitArr=(           "fill"      "contain" "cover" "none"      "scale-down" )
+backgroundSizeEquivArr=( "100% 100%" "contain" "cover" "auto auto" "auto auto"  )
+numObjectFitVals=${#objectFitArr[@]}
+
+# Array of tag-names for elements that we'd like to test:
+# (Also: array of a single-letter abbreviation for each element, an array of
+# the close tag for each element -- if a close tag is needed -- and an array
+# indicating the attribute that each element uses to specify its image source.)
+tagNameArr=(       "embed" "img" "object"    "video" )
+tagLetterArr=(     "e"     "i"   "o"         "p" )
+tagCloseTokenArr=( ""      ""    "</object>" "</video>" )
+tagSrcAttrArr=(        "src"   "src" "data"      "poster" )
+numTags=${#tagNameArr[@]}
+
+# FIRST: Add 'default-preferences' line to the top of our reftest manifest:
+echo "default-preferences test-pref(layout.css.object-fit-and-position.enabled,true)
+# Tests for 'object-fit' / 'object-position' with a PNG image" \
+ >> $REFTEST_LIST_FILE
+
+for ((i = 0; i < $numObjectFitVals; i++)); do
+  objectFit=${objectFitArr[$i]}
+  backgroundSizeEquiv=${backgroundSizeEquivArr[$i]}
+
+  # The reference case for "scale-down" needs an additional style rule, to
+  # look like "object-fit: scale-down" on small objects. (This is necessary
+  # because "background-size" doesn't have a value that exactly maps to
+  # "object-fit: scale-down".)
+  if [[ $objectFit == "scale-down" ]]; then
+      scaledownRule=".objectOuter > .small { background-size: contain; }"
+      scaledownSedCmd="s/REPLACEME_SCALE_DOWN_EXTRA_RULE/$scaledownRule/"
+  else
+      # (We're not testing "scale-down" in this generated file, so just delete
+      # the template's placeholder line for a "scale-down"-specific CSS rule.)
+      scaledownSedCmd="/REPLACEME_SCALE_DOWN_EXTRA_RULE/d"
+  fi
+
+  for ((j = 0; j < $numImageFiles; j++)); do
+    imageFile=${imageFileArr[$j]}
+    let testNum=$j+1
+    testNum="00$testNum" # zero-pad to 3 digits, per w3c convention
+
+    filenameStub="object-fit-$objectFit-$imageFileFormat-$testNum"
+
+    # Generate a reference case:
+    filenameRef="$filenameStub-ref.html"
+    echo Generating ${filenameRef}.
+    cat $TEMPLATE_REFERENCE_FILENAME \
+      | sed "s,REPLACEME_IMAGE_FILENAME,$imageFile," \
+      | sed "s/REPLACEME_BACKGROUND_SIZE_VAL/$backgroundSizeEquiv/" \
+      | sed "$scaledownSedCmd" \
+      > $FILE_PATH/$filenameRef;
+
+    # Generate a test for each of our tags:
+    for ((k = 0; k < $numTags; k++)); do
+      tagName=${tagNameArr[$k]}
+      tagLetter=${tagLetterArr[$k]}
+      tagCloseToken=${tagCloseTokenArr[$k]}
+      tagSrcAttr=${tagSrcAttrArr[$k]}
+
+      filenameTest="$filenameStub$tagLetter.html"
+      testTitle="'object-fit: $objectFit' on $tagName element, with a PNG image and with various 'object-position' values"
+      echo Generating ${filenameTest}.
+      cat $TEMPLATE_TESTCASE_FILENAME \
+        | sed "s,REPLACEME_IMAGE_FILENAME,$imageFile," \
+        | sed "s/REPLACEME_TEST_TITLE/$testTitle/" \
+        | sed "s,REPLACEME_REFERENCE_FILENAME,$filenameRef," \
+        | sed "s/REPLACEME_CONTAINER_TAG/$tagName/" \
+        | sed "s,REPLACEME_CONTAINER_CLOSETAG,$tagCloseToken,"  \
+        | sed "s/REPLACEME_SRC_ATTR/$tagSrcAttr/" \
+        | sed "s/REPLACEME_OBJECT_FIT_VAL/$objectFit/" \
+        > $FILE_PATH/$filenameTest
+
+      echo "== $filenameTest $filenameRef" \
+        >> $REFTEST_LIST_FILE
+    done
+  done
+done