diff --git a/testing/web-platform/tests/encoding/legacy-mb-schinese/gbk/gbk-encoder.html b/testing/web-platform/tests/encoding/legacy-mb-schinese/gbk/gbk-encoder.html
index 07a129371af89..43634885177ca 100644
--- a/testing/web-platform/tests/encoding/legacy-mb-schinese/gbk/gbk-encoder.html
+++ b/testing/web-platform/tests/encoding/legacy-mb-schinese/gbk/gbk-encoder.html
@@ -10,6 +10,26 @@
 gbk
 >
 <
+!
+-
+-
+if
+the
+server
+overrides
+this
+it
+is
+stupid
+as
+this
+is
+a
+testsuite
+-
+-
+>
+<
 script
 src
 =
@@ -359,6 +379,733 @@
 "
 )
 ;
+encode
+(
+"
+\
+u
+{
+10FFFF
+}
+"
+"
+%
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+%
+231114111
+%
+3B
+"
+"
+U
++
+10FFFF
+"
+)
+;
+/
+/
+GB18030
+-
+2022
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+"
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+uFE10
+"
+"
+%
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+D9
+"
+"
+GB18030
+-
+2022
+1
+"
+)
+;
+encode
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+"
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+"
+"
+%
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+%
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+"
+"
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+-
+2022
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+"
+)
+;
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+"
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+"
+"
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+%
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+"
+"
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+-
+2022
+3
+"
+)
+;
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+"
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+"
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+"
+"
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+"
+)
+;
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+"
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+"
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+"
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+-
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+"
+)
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+"
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+"
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+-
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+"
+)
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+"
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+"
+"
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+"
+)
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+"
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+"
+"
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+"
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+-
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+"
+)
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+"
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+"
+%
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+"
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+-
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+"
+)
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+"
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+"
+"
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+"
+"
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+-
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+"
+)
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+"
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+"
+"
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+"
+"
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+-
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+"
+)
+;
+encode
+(
+"
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+u9FB5
+"
+"
+%
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+"
+"
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+-
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+"
+)
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+"
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+"
+"
+%
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+"
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+-
+2022
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+"
+)
+;
+encode
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+"
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+u9FB7
+"
+"
+%
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+"
+"
+GB18030
+-
+2022
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+"
+)
+;
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+"
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+"
+"
+%
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+"
+"
+GB18030
+-
+2022
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+"
+)
+;
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+"
+\
+u9FB9
+"
+"
+%
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+"
+"
+GB18030
+-
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+"
+)
+;
+encode
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+"
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+u9FBA
+"
+"
+%
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+"
+"
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+-
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+"
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+encode
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+"
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+"
+"
+%
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+"
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+-
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+"
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+;
+encode
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+"
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+"
+"
+%
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+"
+"
+GB18030
+-
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+"
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+"
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+"
+"
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+"
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+-
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+"
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+"
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+"
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+"
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+-
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+"
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+"
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+-
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+"
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+"
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+"
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+"
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+-
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+"
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+"
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+"
+"
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+"
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+-
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+"
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+"
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+"
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+"
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+-
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+"
+)
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+"
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+"
+"
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+-
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+"
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+"
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+"
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+-
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+"
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+"
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+"
+"
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+-
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+"
+)
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+"
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+"
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+"
+)
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+"
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+"
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+"
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+"
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+"
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+"
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+"
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+"
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+"
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+"
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+"
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+uE864
+"
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+"
+"
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+-
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+"
+)
+;
 <
 /
 script