diff --git a/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-restricted-block-size-cell.html b/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-restricted-block-size-cell.html
new file mode 100644
index 0000000000000..f532308484383
--- /dev/null
+++ b/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-restricted-block-size-cell.html
@@ -0,0 +1,20 @@
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+
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+There should be a 100px tall pink block below, with a scrollable box inside.
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+
diff --git a/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-unrestricted-block-size-cell.tentative.html b/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-unrestricted-block-size-cell.tentative.html
new file mode 100644
index 0000000000000..ffbb796b6afe0
--- /dev/null
+++ b/testing/web-platform/tests/css/css-tables/percent-height-overflow-auto-in-unrestricted-block-size-cell.tentative.html
@@ -0,0 +1,11 @@
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+Test passes if there is a filled green square.
+