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diff --git a/testing/web-platform/tests/css/css-images/tools/generate-object-position-png-tests.sh b/testing/web-platform/tests/css/css-images/tools/generate-object-position-png-tests.sh
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+++ b/testing/web-platform/tests/css/css-images/tools/generate-object-position-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" (focusing on edge-case
+# object-position values that require pixel rounding), 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.
+
+FILE_PATH="./"
+REFTEST_LIST_FILE="$FILE_PATH/reftest.list"
+
+TEMPLATE_TESTCASE_FILENAME=$FILE_PATH/support/template-object-position-test.html
+TEMPLATE_REFERENCE_FILENAME=$FILE_PATH/support/template-object-position-ref.html
+
+imageFileFormat="png"
+
+# Array of image files to use for testing:
+imageFileArr=("support/colors-16x8.png" "support/colors-8x16.png")
+numImageFiles=${#imageFileArr[@]}
+
+# Array of CSS classes to delete from the template, for a given image-file.
+# DETAILS: The template files contain some elements/styles that exercise
+# object-position x-values (op_x), and other elements/styles that exercise
+# object-position y-values (op_y). But actually, we'll only have extra space
+# for these percent values to resolve against in *one* dimension (since our
+# image-files are rectangular, and the container element is square, and we
+# scale the image up with "object-fit: contain"). So, we delete the
+# elements/styles in the dimension where object-position % values will just
+# resolve to 0 ("op_x" for the fat image, and "op_y" for the tall image).
+classPatternToDeleteArr=("op_x" "op_y")
+
+# 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[@]}
+
+  for ((j = 0; j < $numImageFiles; j++)); do
+    imageFile=${imageFileArr[$j]}
+
+    classPatternToDelete=${classPatternToDeleteArr[$j]}
+
+    let testNum=$j+1
+    testNum="00$testNum" # zero-pad to 3 digits, per w3c convention
+
+    filenameStub="object-position-$imageFileFormat-$testNum"
+
+    # Generate a reference case:
+    filenameRef="$filenameStub-ref.html"
+    echo Generating ${filenameRef}.
+    cat $TEMPLATE_REFERENCE_FILENAME \
+      | sed "s,REPLACEME_IMAGE_FILENAME,$imageFile," \
+      | sed "/$classPatternToDelete/d" \
+      > $FILE_PATH/$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="various 'object-position' values on a fixed-size $tagName element, with a PNG image and 'object-fit:contain'."
+      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/$tagSrcAttr/" \
+        | sed "/$classPatternToDelete/d" \
+        > $FILE_PATH/$filenameTest
+
+      echo "== $filenameTest $filenameRef" \
+        >> $REFTEST_LIST_FILE
+    done
+  done