diff --git a/layout/forms/nsRangeFrame.cpp b/layout/forms/nsRangeFrame.cpp
index 68c0cbdb3fb9..94cc5d49d729 100644
--- a/layout/forms/nsRangeFrame.cpp
+++ b/layout/forms/nsRangeFrame.cpp
@@ -741,13 +741,6 @@ LogicalSize nsRangeFrame::ComputeAutoSize(
 }
 
 nscoord nsRangeFrame::GetMinISize(gfxContext* aRenderingContext) {
-  auto pos = StylePosition();
-  auto wm = GetWritingMode();
-  if (pos->ISize(wm).HasPercent()) {
-    // https://drafts.csswg.org/css-sizing-3/#percentage-sizing
-    // https://drafts.csswg.org/css-sizing-3/#min-content-zero
-    return nsLayoutUtils::ResolveToLength<true>(pos->ISize(wm), nscoord(0));
-  }
   return GetPrefISize(aRenderingContext);
 }
 
diff --git a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1-ref.html b/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1-ref.html
deleted file mode 100644
index a4419eab319e..000000000000
--- a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1-ref.html
+++ /dev/null
@@ -1,161 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: INPUT type=range percent intrinsic inline-size</title>
-  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1513959">
-  <style>
-html,body {
-  color:black; background-color:white; font:16px/1 monospace;
-}
-
-input { margin: 2px; }
-
-input.i {
-  min-width: 0;
-  background: lime;
-}
-
-input.mi {
-  min-width: 0;
-  max-width: 100%;
-  width: -moz-max-content;
-  width: max-content;
-  background: lime;
-}
-
-.n {
-  -webkit-appearance: none;
-}
-
-div {
-  display: inline-block;
-  border:1px solid;
-}
-
-.grid {
-  display: inline-grid;
-  grid: auto / min-content;
-  place-items: start;
-}
-
-.outerFlex {
-  display: flex;
-  width: 100px;
-  border: 1px solid black;
-}
-.innerFlex {
-  display: grid;
-  border: 1px solid pink;
-}
-.innerFlex > input {
-  min-width: 0;
-  justify-self: stretch;
-  background: yellow;
-  -moz-appearance: none;
-  -webkit-appearance: none;
-}
-
-</style></head><body>
-
-<div style="width:30px"><div style="width:28px">
-  <input type="range" class="i" style="width:14px; margin-right:0">
-</div></div>
-
-<div style="width:200px"><div style="">
-  <input type="range" class="i" style="max-width:50%">
-</div></div>
-
-<div class="grid" style="grid-template-columns:4px">
-  <input type="range" class="i" style="width:2px;">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i" style="width:15px">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i" style="width:15px">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i min-auto" style="width:15px">
-</div>
-
-<div style="width:30px"><div style="width:28px;">
-  <input type="range" class="i n" style="width:14px; margin-right:0">
-</div></div>
-
-<div class="grid" style="grid-template-columns:4px">
-  <input type="range" class="i n" style="width:2px;">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i n" style="width:15px">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i n" style="width:15px">
-</div>
-
-<div class="grid" style="grid-template-columns:30px">
-  <input type="range" class="i n min-auto" style="width:15px">
-</div>
-
-<br>
-<br>
-
-<div style="width:30px"><div>
-  <input type="range" class="mi">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="mi">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="mi">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="mi">
-</div>
-
-<div style="width:30px"><div>
-  <input type="range" class="mi n">
-</div></div>
-
-<div style="width:30px"><div style="width:-moz-max-content;width:max-content">
-  <input type="range" class="mi n" style="width:50%">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="width:30px; grid-template-columns:15px">
-  <input type="range" class="mi n min-auto">
-</div>
-
-<br>
-<br>
-
-<div class="outerFlex">
-  <div class="innerFlex">
-    <input type="range">
-  </div>
-  abc
-</div>
-
-</body></html>
diff --git a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1.html b/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1.html
deleted file mode 100644
index 87399578988a..000000000000
--- a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-1.html
+++ /dev/null
@@ -1,169 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Test: INPUT type=range percent intrinsic inline-size</title>
-  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1513959">
-  <link rel="help" href="https://drafts.csswg.org/css-sizing-3/#percentage-sizing">
-  <link rel="help" href="https://drafts.csswg.org/css-sizing-3/#min-content-zero">
-  <link rel="match" href="range-percent-intrinsic-size-1-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:16px/1 monospace;
-}
-
-input { margin: 2px; }
-
-input.i {
-  width: 50%;
-  min-width: -moz-min-content;
-  min-width: min-content;
-  background: lime;
-}
-
-input.mi {
-  max-width: 50%;
-  min-width: -moz-min-content;
-  min-width: min-content;
-  background: lime;
-}
-
-input.i.min-auto, input.mi.min-auto {
-  min-width: auto;
-}
-
-.n {
-  -webkit-appearance: none;
-}
-
-div {
-  display: inline-block;
-  border:1px solid;
-}
-
-.grid {
-  display: inline-grid;
-  grid: auto / min-content;
-  place-items: start;
-}
-
-.outerFlex {
-  display: flex;
-  width: 100px;
-  border: 1px solid black;
-}
-.innerFlex {
-  display: flex;
-  border: 1px solid pink;
-}
-.innerFlex > input {
-  width: 50%;
-  flex: 1;
-  background: yellow;
-  -moz-appearance: none;
-  -webkit-appearance: none;
-}
-
-</style></head><body>
-
-<div style="width:30px"><div>
-  <input type="range" class="i">
-</div></div>
-
-<div style="width:200px"><div>
-  <input type="range" class="i">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="i">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="i">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="i">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="i min-auto">
-</div>
-
-<div style="width:30px"><div>
-  <input type="range" class="i n">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="i n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="i n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="i n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="i n min-auto">
-</div>
-
-<br>
-<br>
-
-<div style="width:30px"><div>
-  <input type="range" class="mi">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="mi">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="mi">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="mi">
-</div>
-
-<div style="width:30px"><div>
-  <input type="range" class="mi n">
-</div></div>
-
-<div style="width:30px"><div>
-  <input type="range" class="mi n min-auto">
-</div></div>
-
-<div class="grid">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(min-content,30px)">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="mi n">
-</div>
-
-<div class="grid" style="grid-template-columns:minmax(auto,30px)">
-  <input type="range" class="mi n min-auto">
-</div>
-
-<br>
-<br>
-
-<div class="outerFlex">
-  <div class="innerFlex">
-    <input type="range">
-  </div>
-  abc
-</div>
-
-</body></html>
diff --git a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html b/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html
deleted file mode 100644
index 83eff4b45c2c..000000000000
--- a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html
+++ /dev/null
@@ -1,136 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: INPUT type=range percent intrinsic block-size</title>
-  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1513959">
-  <style>
-html,body {
-  color:black; background-color:white; font:16px/1 monospace;
-}
-
-input { margin: 2px; }
-
-input.b {
-  min-height: 0;
-  background: lime;
-}
-
-input.mb {
-  min-height: 0;
-  max-height: 100%;
-  background: lime;
-}
-
-.n {
-  -webkit-appearance: none;
-}
-
-div {
-  display: inline-block;
-  border:1px solid;
-}
-
-.grid {
-  display: inline-grid;
-  grid: auto / min-content;
-  place-items: start;
-}
-input[orient="vertical"] {
-  -webkit-appearance: slider-vertical;
-  -webkit-appearance: range;
-}
-
-</style></head><body>
-
-<div style="height:30px"><div>
-  <input type="range" class="b" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b" orient="vertical" style="height:50%; grid-area:1/1">
-  <input type="range" class="b" orient="vertical" style="visibility:hidden; grid-area:1/1">
-</div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b" orient="vertical" style="height:50%; grid-area:1/1">
-  <input type="range" class="b" orient="vertical" style="visibility:hidden; grid-area:1/1">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div style="height:30px"><div>
-  <input type="range" class="b n" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b" orient="vertical" style="height:50%; grid-area:1/1">
-  <input type="range" class="b" orient="vertical" style="visibility:hidden; grid-area:1/1">
-</div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b" orient="vertical" style="height:50%; grid-area:1/1">
-  <input type="range" class="b" orient="vertical" style="visibility:hidden; grid-area:1/1">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<br>
-<br>
-
-<div style="height:30px"><div>
-  <input type="range" class="mb" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: 4px / auto">
-  <input type="range" class="mb" orient="vertical" style="height:2px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
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-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div style="height:30px"><div>
-  <input type="range" class="mb n" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: 4px / auto">
-  <input type="range" class="mb n" orient="vertical" style="height:2px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
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-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-<div class="grid" style="grid: 30px / auto">
-  <input type="range" class="b" orient="vertical" style="height:15px">
-</div>
-
-</body></html>
diff --git a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2.html b/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2.html
deleted file mode 100644
index e11e2955891f..000000000000
--- a/testing/web-platform/tests/css/css-sizing/range-percent-intrinsic-size-2.html
+++ /dev/null
@@ -1,145 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Test: INPUT type=range percent intrinsic block-size</title>
-  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1513959">
-  <link rel="help" href="https://drafts.csswg.org/css-sizing-3/#percentage-sizing">
-  <link rel="help" href="https://drafts.csswg.org/css-sizing-3/#min-content-zero">
-  <link rel="match" href="range-percent-intrinsic-size-2-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:16px/1 monospace;
-}
-
-input { margin: 2px; }
-
-input.b {
-  height: 50%;
-  min-height: -moz-min-content;
-  min-height: min-content;
-  background: lime;
-}
-
-input.mb {
-  max-height: 50%;
-  min-height: -moz-min-content;
-  min-height: min-content;
-  background: lime;
-}
-
-input.b.min-auto, input.mb.min-auto, {
-  min-height: auto;
-}
-
-.n {
-  -webkit-appearance: none;
-}
-
-div {
-  display: inline-block;
-  border:1px solid;
-}
-
-.grid {
-  display: inline-grid;
-  grid: auto / min-content;
-  place-items: start;
-}
-input[orient="vertical"] {
-  -webkit-appearance: slider-vertical;
-  -webkit-appearance: range;
-}
-
-</style></head><body>
-
-<div style="height:30px"><div>
-  <input type="range" class="b" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(min-content,30px) / auto">
-  <input type="range" class="b" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="b" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="b min-auto" orient="vertical">
-</div>
-
-<div style="height:30px"><div>
-  <input type="range" class="b n" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="b n" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(min-content,30px) / auto">
-  <input type="range" class="b n" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="b n" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="b n min-auto" orient="vertical">
-</div>
-
-
-<br>
-<br>
-
-<div style="height:30px"><div>
-  <input type="range" class="mb" orient="vertical">
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-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="mb" orient="vertical">
-</div>
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-<div class="grid" style="grid: minmax(min-content,30px) / auto">
-  <input type="range" class="mb" orient="vertical">
-</div>
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-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="mb" orient="vertical">
-</div>
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-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="mb min-auto" orient="vertical">
-</div>
-
-
-<div style="height:30px"><div>
-  <input type="range" class="mb n" orient="vertical">
-</div></div>
-
-<div class="grid" style="grid: min-content / auto">
-  <input type="range" class="mb n" orient="vertical">
-</div>
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-  <input type="range" class="mb n" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="mb n" orient="vertical">
-</div>
-
-<div class="grid" style="grid: minmax(auto,30px) / auto">
-  <input type="range" class="mb n min-auto" orient="vertical">
-</div>
-
-
-</body></html>
