[css-text] Add test for text-transform:fullwidth and space collapsing (#17956)
diff --git a/css/css-text/text-transform/reference/text-transform-fullwidth-006-ref.html b/css/css-text/text-transform/reference/text-transform-fullwidth-006-ref.html
new file mode 100644
index 0000000..3d2f9c7
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+++ b/css/css-text/text-transform/reference/text-transform-fullwidth-006-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test Reference</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+ font: 50px/1 Ahem;
+ color: green;
+}
+</style>
+
+<p>Test passes if there are two green squares and no red.
+<div>x　x</div>
diff --git a/css/css-text/text-transform/reference/text-transform-fullwidth-007-ref.html b/css/css-text/text-transform/reference/text-transform-fullwidth-007-ref.html
new file mode 100644
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+++ b/css/css-text/text-transform/reference/text-transform-fullwidth-007-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test reference</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+ font: 50px/1 Ahem;
+ color: green;
+}
+</style>
+
+<p>Test passes if there are two green squares and no red.
+<div>x　　　x</div>
diff --git a/css/css-text/text-transform/text-transform-fullwidth-006.html b/css/css-text/text-transform/text-transform-fullwidth-006.html
new file mode 100644
index 0000000..b0a5097
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+++ b/css/css-text/text-transform/text-transform-fullwidth-006.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: text-transform:fullwidth and collapsed spaces</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<link rel="help" href="https://www.w3.org/TR/css-text-3/#text-transform-property">
+<link rel="match" href="reference/text-transform-fullwidth-006-ref.html">
+<meta name="assert" content="full-width does not transform collapsed U+0020 spaces to U+3000, only the remaining one after collapsing.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div { font: 50px/1 Ahem; }
+#test {
+ text-transform: fullwidth;
+ color: green;
+}
+#ref {
+ color: red;
+ position: absolute;
+ z-index: -1;
+}
+</style>
+
+<p>Test passes if there are two green squares and no red.
+<div id=ref>x　x</div>
+<div id=test>x x</div>
diff --git a/css/css-text/text-transform/text-transform-fullwidth-007.html b/css/css-text/text-transform/text-transform-fullwidth-007.html
new file mode 100644
index 0000000..6e08154
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+++ b/css/css-text/text-transform/text-transform-fullwidth-007.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: text-transform:fullwidth and preserved spaces</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<link rel="help" href="https://www.w3.org/TR/css-text-3/#text-transform-property">
+<link rel="match" href="reference/text-transform-fullwidth-007-ref.html">
+<meta name="assert" content="full-width does transforms U+0020 spaces to U+3000 within preserved white space.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div { font: 50px/1 Ahem; }
+#test {
+ text-transform: fullwidth;
+ color: green;
+ white-space: pre-wrap;
+}
+#ref {
+ color: red;
+ position: absolute;
+ z-index: -1;
+}
+</style>
+
+<p>Test passes if there are two green squares and no red.
+<div id=ref>x　　　x</div>
+<div id=test>x x</div>
