--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -4100,18 +4100,18 @@ CSS_PROP_TEXT(
     offsetof(nsStyleText, mTextShadow),
     eStyleAnimType_Shadow)
 CSS_PROP_TEXT(
     -moz-text-size-adjust,
     _moz_text_size_adjust,
     CSS_PROP_DOMPROP_PREFIXED(TextSizeAdjust),
     CSS_PROPERTY_PARSE_VALUE,
     "",
-    VARIANT_AUTO | VARIANT_NONE | VARIANT_INHERIT,
-    nullptr,
+    VARIANT_HK,
+    kTextSizeAdjustKTable,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Discrete)
 CSS_PROP_SHORTHAND(
     -webkit-text-stroke,
     _webkit_text_stroke,
     WebkitTextStroke,
     CSS_PROPERTY_PARSE_FUNCTION,
     "layout.css.prefixes.webkit")

--- a/layout/style/nsCSSProps.cpp
+++ b/layout/style/nsCSSProps.cpp
@@ -2059,16 +2059,22 @@ const KTableEntry nsCSSProps::kTextEmpha
 };
 
 const KTableEntry nsCSSProps::kTextOverflowKTable[] = {
   { eCSSKeyword_clip, NS_STYLE_TEXT_OVERFLOW_CLIP },
   { eCSSKeyword_ellipsis, NS_STYLE_TEXT_OVERFLOW_ELLIPSIS },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
+const KTableEntry nsCSSProps::kTextSizeAdjustKTable[] = {
+  { eCSSKeyword_none, NS_STYLE_TEXT_SIZE_ADJUST_NONE },
+  { eCSSKeyword_auto, NS_STYLE_TEXT_SIZE_ADJUST_AUTO },
+  { eCSSKeyword_UNKNOWN, -1 }
+};
+
 const KTableEntry nsCSSProps::kTextTransformKTable[] = {
   { eCSSKeyword_none, NS_STYLE_TEXT_TRANSFORM_NONE },
   { eCSSKeyword_capitalize, NS_STYLE_TEXT_TRANSFORM_CAPITALIZE },
   { eCSSKeyword_lowercase, NS_STYLE_TEXT_TRANSFORM_LOWERCASE },
   { eCSSKeyword_uppercase, NS_STYLE_TEXT_TRANSFORM_UPPERCASE },
   { eCSSKeyword_full_width, NS_STYLE_TEXT_TRANSFORM_FULL_WIDTH },
   { eCSSKeyword_UNKNOWN, -1 }
 };

--- a/layout/style/nsCSSProps.h
+++ b/layout/style/nsCSSProps.h
@@ -844,16 +844,17 @@ public:
   static const KTableEntry kTextCombineUprightKTable[];
   static const KTableEntry kTextDecorationLineKTable[];
   static const KTableEntry kTextDecorationStyleKTable[];
   static const KTableEntry kTextEmphasisPositionKTable[];
   static const KTableEntry kTextEmphasisStyleFillKTable[];
   static const KTableEntry kTextEmphasisStyleShapeKTable[];
   static const KTableEntry kTextOrientationKTable[];
   static const KTableEntry kTextOverflowKTable[];
+  static const KTableEntry kTextSizeAdjustKTable[];
   static const KTableEntry kTextTransformKTable[];
   static const KTableEntry kTouchActionKTable[];
   static const KTableEntry kTopLayerKTable[];
   static const KTableEntry kTransformBoxKTable[];
   static const KTableEntry kTransitionTimingFunctionKTable[];
   static const KTableEntry kUnicodeBidiKTable[];
   static const KTableEntry kUserFocusKTable[];
   static const KTableEntry kUserInputKTable[];

--- a/layout/style/nsComputedDOMStyle.cpp
+++ b/layout/style/nsComputedDOMStyle.cpp
@@ -4104,16 +4104,25 @@ already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetTextShadow()
 {
   return GetCSSShadowArray(StyleText()->mTextShadow,
                            StyleColor()->mColor,
                            false);
 }
 
 already_AddRefed<CSSValue>
+nsComputedDOMStyle::DoGetTextSizeAdjust()
+{
+  RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
+  val->SetIdent(nsCSSProps::ValueToKeywordEnum(StyleText()->mTextSizeAdjust,
+                                               nsCSSProps::kTextSizeAdjustKTable));
+  return val.forget();
+}
+
+already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetTextTransform()
 {
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
   val->SetIdent(
     nsCSSProps::ValueToKeywordEnum(StyleText()->mTextTransform,
                                    nsCSSProps::kTextTransformKTable));
   return val.forget();
 }
@@ -4198,34 +4207,16 @@ nsComputedDOMStyle::DoGetHyphens()
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
   val->SetIdent(
     nsCSSProps::ValueToKeywordEnum(StyleText()->mHyphens,
                                    nsCSSProps::kHyphensKTable));
   return val.forget();
 }
 
 already_AddRefed<CSSValue>
-nsComputedDOMStyle::DoGetTextSizeAdjust()
-{
-  RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
-  switch (StyleText()->mTextSizeAdjust) {
-    default:
-      NS_NOTREACHED("unexpected value");
-      MOZ_FALLTHROUGH;
-    case NS_STYLE_TEXT_SIZE_ADJUST_AUTO:
-      val->SetIdent(eCSSKeyword_auto);
-      break;
-    case NS_STYLE_TEXT_SIZE_ADJUST_NONE:
-      val->SetIdent(eCSSKeyword_none);
-      break;
-  }
-  return val.forget();
-}
-
-already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetWebkitTextFillColor()
 {
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
   SetValueFromComplexColor(val, StyleText()->mWebkitTextFillColor);
   return val.forget();
 }
 
 already_AddRefed<CSSValue>

--- a/layout/style/nsComputedDOMStyle.h
+++ b/layout/style/nsComputedDOMStyle.h
@@ -431,26 +431,26 @@ private:
   already_AddRefed<CSSValue> DoGetTextDecorationLine();
   already_AddRefed<CSSValue> DoGetTextDecorationStyle();
   already_AddRefed<CSSValue> DoGetTextEmphasisColor();
   already_AddRefed<CSSValue> DoGetTextEmphasisPosition();
   already_AddRefed<CSSValue> DoGetTextEmphasisStyle();
   already_AddRefed<CSSValue> DoGetTextIndent();
   already_AddRefed<CSSValue> DoGetTextOrientation();
   already_AddRefed<CSSValue> DoGetTextOverflow();
+  already_AddRefed<CSSValue> DoGetTextShadow();
+  already_AddRefed<CSSValue> DoGetTextSizeAdjust();
   already_AddRefed<CSSValue> DoGetTextTransform();
-  already_AddRefed<CSSValue> DoGetTextShadow();
   already_AddRefed<CSSValue> DoGetLetterSpacing();
   already_AddRefed<CSSValue> DoGetWordSpacing();
   already_AddRefed<CSSValue> DoGetWhiteSpace();
   already_AddRefed<CSSValue> DoGetWordBreak();
   already_AddRefed<CSSValue> DoGetOverflowWrap();
   already_AddRefed<CSSValue> DoGetHyphens();
   already_AddRefed<CSSValue> DoGetTabSize();
-  already_AddRefed<CSSValue> DoGetTextSizeAdjust();
   already_AddRefed<CSSValue> DoGetWebkitTextFillColor();
   already_AddRefed<CSSValue> DoGetWebkitTextStrokeColor();
   already_AddRefed<CSSValue> DoGetWebkitTextStrokeWidth();
 
   /* Visibility properties */
   already_AddRefed<CSSValue> DoGetColorAdjust();
   already_AddRefed<CSSValue> DoGetOpacity();
   already_AddRefed<CSSValue> DoGetPointerEvents();

--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -4926,23 +4926,22 @@ nsRuleNode::ComputeTextData(void* aStart
 
   // ruby-position: enum, inherit, initial
   SetValue(*aRuleData->ValueForRubyPosition(),
            text->mRubyPosition, conditions,
            SETVAL_ENUMERATED | SETVAL_UNSET_INHERIT,
            parentText->mRubyPosition,
            NS_STYLE_RUBY_POSITION_OVER);
 
-  // text-size-adjust: none, auto, inherit, initial
-  SetValue(*aRuleData->ValueForTextSizeAdjust(), text->mTextSizeAdjust,
-           conditions, SETVAL_UNSET_INHERIT,
+  // text-size-adjust: enum, inherit, initial
+  SetValue(*aRuleData->ValueForTextSizeAdjust(),
+           text->mTextSizeAdjust, conditions,
+           SETVAL_ENUMERATED | SETVAL_UNSET_INHERIT,
            parentText->mTextSizeAdjust,
-           /* initial */ NS_STYLE_TEXT_SIZE_ADJUST_AUTO,
-           /* auto */ NS_STYLE_TEXT_SIZE_ADJUST_AUTO,
-           /* none */ NS_STYLE_TEXT_SIZE_ADJUST_NONE, Unused, Unused);
+           NS_STYLE_TEXT_SIZE_ADJUST_AUTO);
 
   // text-combine-upright: enum, inherit, initial
   SetValue(*aRuleData->ValueForTextCombineUpright(),
            text->mTextCombineUpright,
            conditions,
            SETVAL_ENUMERATED | SETVAL_UNSET_INHERIT,
            parentText->mTextCombineUpright,
            NS_STYLE_TEXT_COMBINE_UPRIGHT_NONE);