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fix: allow characters in the supplementary special-purpose plane #15823

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Merged
merged 1 commit into from
Apr 23, 2025
+12 −0
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fix: allow characters in the supplementary special-purpose plane #15823

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5 changes: 5 additions & 0 deletions .changeset/wild-bulldogs-move.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

fix: allow characters in the supplementary special-purpose plane
7 changes: 7 additions & 0 deletions packages/svelte/src/compiler/phases/1-parse/utils/html.js
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Expand Up @@ -72,6 +72,8 @@ const NUL = 0;
// to replace them ourselves
//
// Source: http://en.wikipedia.org/wiki/Character_encodings_in_HTML#Illegal_characters
// Also see: https://en.wikipedia.org/wiki/Plane_(Unicode)
// Also see: https://html.spec.whatwg.org/multipage/parsing.html#preprocessing-the-input-stream

/** @param {number} code */
function validate_code(code) {
Expand Down Expand Up @@ -116,5 +118,10 @@ function validate_code(code) {
return code;
}

// supplementary special-purpose plane 0xe0000 - 0xe07f and 0xe0100 - 0xe01ef
if ((code >= 917504 && code <= 917631) || (code >= 917760 && code <= 917999)) {
return code;
}

return NUL;
}