--- a/vendor/golang.org/x/net/html/token.go	Sat Feb 04 13:35:58 2023 +0100
+++ b/vendor/golang.org/x/net/html/token.go	Sat Feb 18 04:11:30 2023 +0000
@@ -598,6 +598,11 @@
 // readComment reads the next comment token starting with "<!--". The opening
 // "<!--" has already been consumed.
 func (z *Tokenizer) readComment() {
+	// When modifying this function, consider manually increasing the suffixLen
+	// constant in func TestComments, from 6 to e.g. 9 or more. That increase
+	// should only be temporary, not committed, as it exponentially affects the
+	// test running time.
+
 	z.data.start = z.raw.end
 	defer func() {
 		if z.data.end < z.data.start {
@@ -611,11 +616,7 @@
 	for {
 		c := z.readByte()
 		if z.err != nil {
-			// Ignore up to two dashes at EOF.
-			if dashCount > 2 {
-				dashCount = 2
-			}
-			z.data.end = z.raw.end - dashCount
+			z.data.end = z.calculateAbruptCommentDataEnd()
 			return
 		}
 		switch c {
@@ -631,12 +632,15 @@
 			if dashCount >= 2 {
 				c = z.readByte()
 				if z.err != nil {
-					z.data.end = z.raw.end
+					z.data.end = z.calculateAbruptCommentDataEnd()
 					return
-				}
-				if c == '>' {
+				} else if c == '>' {
 					z.data.end = z.raw.end - len("--!>")
 					return
+				} else if c == '-' {
+					dashCount = 1
+					beginning = false
+					continue
 				}
 			}
 		}
@@ -645,6 +649,35 @@
 	}
 }
 
+func (z *Tokenizer) calculateAbruptCommentDataEnd() int {
+	raw := z.Raw()
+	const prefixLen = len("<!--")
+	if len(raw) >= prefixLen {
+		raw = raw[prefixLen:]
+		if hasSuffix(raw, "--!") {
+			return z.raw.end - 3
+		} else if hasSuffix(raw, "--") {
+			return z.raw.end - 2
+		} else if hasSuffix(raw, "-") {
+			return z.raw.end - 1
+		}
+	}
+	return z.raw.end
+}
+
+func hasSuffix(b []byte, suffix string) bool {
+	if len(b) < len(suffix) {
+		return false
+	}
+	b = b[len(b)-len(suffix):]
+	for i := range b {
+		if b[i] != suffix[i] {
+			return false
+		}
+	}
+	return true
+}
+
 // readUntilCloseAngle reads until the next ">".
 func (z *Tokenizer) readUntilCloseAngle() {
 	z.data.start = z.raw.end