diff --git a/intl/unicharutil/util/nsSpecialCasingData.cpp b/intl/unicharutil/util/nsSpecialCasingData.cpp
index 02653b857..ccbc5ed37 100644
--- a/intl/unicharutil/util/nsSpecialCasingData.cpp
+++ b/intl/unicharutil/util/nsSpecialCasingData.cpp
@@ -9,8 +9,8 @@
#include "mozilla/ArrayUtils.h" // for ArrayLength
#include // for bsearch
-/* SpecialCasing-11.0.0.txt */
-/* Date: 2018-02-22, 06:16:47 GMT */
+/* SpecialCasing-17.0.0.txt */
+/* Date: 2025-07-31, 22:11:55 GMT */
using mozilla::unicode::MultiCharMapping;
diff --git a/layout/reftests/text-transform/all-lower-ref.html b/layout/reftests/text-transform/all-lower-ref.html
index c323aa251..4ae5fa850 100644
--- a/layout/reftests/text-transform/all-lower-ref.html
+++ b/layout/reftests/text-transform/all-lower-ref.html
@@ -1,10 +1,11 @@
+
@@ -604,6 +605,53 @@
ᏻ
ᏼ
ᏽ
+
+ა
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+გ
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+ე
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+ჴ
+ჵ
+ჶ
+ჷ
+ჸ
+ჹ
+ჺ
+ჽ
+ჾ
+ჿ
ḁ
ḃ
ḅ
@@ -918,6 +966,7 @@
ⱜ
ⱝ
ⱞ
+ⱟ
ⱡ
ɫ
ᵽ
@@ -1087,12 +1136,35 @@
ɜ
ɡ
ɬ
+ɪ
ʞ
ʇ
ʝ
ꭓ
ꞵ
ꞷ
+ꞹ
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+
+
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a
b
c
@@ -1159,6 +1231,77 @@
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𐑎
𐑏
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+𐓜
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+𐓢
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+𐓤
+𐓥
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+𐖶
+𐖷
+𐖸
+𐖹
+𐖻
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𐳀
𐳁
𐳂
@@ -1210,6 +1353,28 @@
𐳰
𐳱
𐳲
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
𑣀
𑣁
𑣂
@@ -1242,6 +1407,97 @@
𑣝
𑣞
𑣟
+𖹠
+𖹡
+𖹢
+𖹣
+𖹤
+𖹥
+𖹦
+𖹧
+𖹨
+𖹩
+𖹪
+𖹫
+𖹬
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+𖹮
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+
+
+
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
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+𞤲
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+𞤵
+𞤶
+𞤷
+𞤸
+𞤹
+𞤺
+𞤻
+𞤼
+𞤽
+𞤾
+𞤿
+𞥀
+𞥁
+𞥂
+𞥃
diff --git a/layout/reftests/text-transform/all-lower.html b/layout/reftests/text-transform/all-lower.html
index 6f73ae845..4cf5b917a 100644
--- a/layout/reftests/text-transform/all-lower.html
+++ b/layout/reftests/text-transform/all-lower.html
@@ -1,10 +1,11 @@
+
@@ -604,6 +605,53 @@
Ᏻ
Ᏼ
Ᏽ
+
+Ა
+Ბ
+Გ
+Დ
+Ე
+Ვ
+Ზ
+Თ
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+Ჸ
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+Ჿ
Ḁ
Ḃ
Ḅ
@@ -918,6 +966,7 @@
Ⱜ
Ⱝ
Ⱞ
+Ⱟ
Ⱡ
Ɫ
Ᵽ
@@ -1087,12 +1136,35 @@
Ɜ
Ɡ
Ɬ
+Ɪ
Ʞ
Ʇ
Ʝ
Ꭓ
Ꞵ
Ꞷ
+Ꞹ
+Ꞻ
+Ꞽ
+Ꞿ
+Ꟁ
+Ꟃ
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+Ꟈ
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+
+
+
+Ꟑ
+
+
+Ꟗ
+Ꟙ
+
+
+Ꟶ
A
B
C
@@ -1159,6 +1231,77 @@
𐐥
𐐦
𐐧
+𐒰
+𐒱
+𐒲
+𐒳
+𐒴
+𐒵
+𐒶
+𐒷
+𐒸
+𐒹
+𐒺
+𐒻
+𐒼
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+𐓂
+𐓃
+𐓄
+𐓅
+𐓆
+𐓇
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+𐓊
+𐓋
+𐓌
+𐓍
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+𐕰
+𐕱
+𐕲
+𐕳
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+𐖁
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+𐖌
+𐖍
+𐖎
+𐖏
+𐖐
+𐖑
+𐖒
+𐖔
+𐖕
𐲀
𐲁
𐲂
@@ -1210,6 +1353,28 @@
𐲰
𐲱
𐲲
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
𑢠
𑢡
𑢢
@@ -1242,6 +1407,97 @@
𑢽
𑢾
𑢿
+𖹀
+𖹁
+𖹂
+𖹃
+𖹄
+𖹅
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
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+
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+𞤛
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+𞤝
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+𞤟
+𞤠
+𞤡
diff --git a/layout/reftests/text-transform/all-title-ref.html b/layout/reftests/text-transform/all-title-ref.html
index 6015bb9ac..3fc14a5ca 100644
--- a/layout/reftests/text-transform/all-title-ref.html
+++ b/layout/reftests/text-transform/all-title-ref.html
@@ -1,4 +1,5 @@
+
@@ -141,6 +142,7 @@
Ƕx
Ƙx
Ƚx
+x
Ƞx
Ơx
Ƣx
@@ -236,10 +238,12 @@
Ɠx
Ɡx
Ɣx
+x
Ɥx
Ɦx
Ɨx
Ɩx
+Ɪx
Ɫx
Ɬx
Ɯx
@@ -248,6 +252,7 @@
Ɵx
Ɽx
Ʀx
+Ʂx
Ʃx
Ʇx
Ʈx
@@ -512,14 +517,71 @@
Օx
Ֆx
Եւx
+აx
+ბx
+გx
+დx
+ეx
+ვx
+ზx
+თx
+იx
+კx
+ლx
+მx
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+ჸx
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+ჺx
+ჽx
+ჾx
+ჿx
Ᏸx
Ᏹx
Ᏺx
Ᏻx
Ᏼx
Ᏽx
+Вx
+Дx
+Оx
+Сx
+Тx
+Тx
+Ъx
+Ѣx
+Ꙋx
+x
Ᵹx
Ᵽx
+Ᶎx
Ḁx
Ḃx
Ḅx
@@ -862,6 +924,7 @@
Ⱜx
Ⱝx
Ⱞx
+Ⱟx
Ⱡx
Ⱥx
Ⱦx
@@ -1048,6 +1111,7 @@
Ꞌx
Ꞑx
Ꞓx
+Ꞔx
Ꞗx
Ꞙx
Ꞛx
@@ -1060,6 +1124,23 @@
Ꞩx
Ꞵx
Ꞷx
+Ꞹx
+Ꞻx
+Ꞽx
+Ꞿx
+Ꟁx
+Ꟃx
+Ꟈx
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Ꭰx
Ꭱx
@@ -1219,6 +1300,77 @@
𐐥x
𐐦x
𐐧x
+𐒰x
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+𐖕x
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𐲁x
𐲂x
@@ -1270,6 +1422,28 @@
𐲰x
𐲱x
𐲲x
+x
+x
+x
+x
+x
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+x
+x
+x
+x
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+x
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+x
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𑢠x
𑢡x
𑢢x
@@ -1302,6 +1476,97 @@
𑢽x
𑢾x
𑢿x
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+𞤡x
diff --git a/layout/reftests/text-transform/all-title.html b/layout/reftests/text-transform/all-title.html
index 0baca20ba..42d90a101 100644
--- a/layout/reftests/text-transform/all-title.html
+++ b/layout/reftests/text-transform/all-title.html
@@ -1,4 +1,5 @@
+
@@ -141,6 +142,7 @@
ƕx
ƙx
ƚx
+ƛx
ƞx
ơx
ƣx
@@ -236,10 +238,12 @@
ɠx
ɡx
ɣx
+ɤx
ɥx
ɦx
ɨx
ɩx
+ɪx
ɫx
ɬx
ɯx
@@ -248,6 +252,7 @@
ɵx
ɽx
ʀx
+ʂx
ʃx
ʇx
ʈx
@@ -512,14 +517,71 @@
օx
ֆx
ևx
+აx
+ბx
+გx
+დx
+ეx
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+ზx
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ḁx
ḃx
ḅx
@@ -862,6 +924,7 @@
ⱜx
ⱝx
ⱞx
+ⱟx
ⱡx
ⱥx
ⱦx
@@ -1048,6 +1111,7 @@
ꞌx
ꞑx
ꞓx
+ꞔx
ꞗx
ꞙx
ꞛx
@@ -1060,6 +1124,23 @@
ꞩx
ꞵx
ꞷx
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@@ -1219,6 +1300,77 @@
𐑍x
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@@ -1270,6 +1422,28 @@
𐳰x
𐳱x
𐳲x
+x
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+x
+x
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+x
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𑣀x
𑣁x
𑣂x
@@ -1302,6 +1476,97 @@
𑣝x
𑣞x
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