diff --git a/.node-version b/.node-version
new file mode 100644
index 0000000000..28c34d2cd8
--- /dev/null
+++ b/.node-version
@@ -0,0 +1 @@
+14.19.0
diff --git a/src/compiler/compile/nodes/Element.ts b/src/compiler/compile/nodes/Element.ts
index 391ce6bace..6218032ee0 100644
--- a/src/compiler/compile/nodes/Element.ts
+++ b/src/compiler/compile/nodes/Element.ts
@@ -628,10 +628,11 @@ export default class Element extends Node {
 					const rel = attribute_map.get('rel');
 					if (rel == null || rel.is_static) {
 						const rel_values = rel ? rel.get_static_value().split(regex_any_repeated_whitespaces) : [];
-						if (!rel || (!rel_values.includes('noopener') && !rel_values.includes('noreferrer'))) {
+						if (!rel || (!rel_values.includes('noreferrer'))) {
 								component.warn(this, {
-									code: 'security-anchor-rel-noopener',
-									message: 'Security: Anchor with "target=_blank" should have rel attribute containing the value "noopener" or "noreferrer"'
+									code: 'security-anchor-rel-noreferrer',
+									message:
+										'Security: Anchor with "target=_blank" should have rel attribute containing the value "noreferrer"'
 								});
 						}
 					}
diff --git a/test/validator/samples/security-anchor-rel-noopener-legacy/_config.js b/test/validator/samples/security-anchor-rel-noopener-legacy/_config.js
new file mode 100644
index 0000000000..52f59c8767
--- /dev/null
+++ b/test/validator/samples/security-anchor-rel-noopener-legacy/_config.js
@@ -0,0 +1,3 @@
+export default {
+	legacy: true
+};
diff --git a/test/validator/samples/security-anchor-rel-noopener-legacy/input.svelte b/test/validator/samples/security-anchor-rel-noopener-legacy/input.svelte
new file mode 100644
index 0000000000..f5361e5cfe
--- /dev/null
+++ b/test/validator/samples/security-anchor-rel-noopener-legacy/input.svelte
@@ -0,0 +1,33 @@
+<a href="https://svelte.dev" target="_blank">svelte website (invalid)</a>
+<a href="https://svelte.dev" target="_blank" rel="">svelte website (invalid)</a>
+<a href="https://svelte.dev" target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href={'https://svelte.dev'} target="_blank">svelte website (invalid)</a>
+<a href={'https://svelte.dev'} target="_blank" rel="">svelte website (invalid)</a>
+<a href={'https://svelte.dev'} target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href="//svelte.dev" target="_blank">svelte website (invalid)</a>
+<a href="//svelte.dev" target="_blank" rel="">svelte website (invalid)</a>
+<a href="//svelte.dev" target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href="http://svelte.dev" target="_blank">svelte website (invalid)</a>
+<a href="http://svelte.dev" target="_blank" rel="">svelte website (invalid)</a>
+<a href="http://svelte.dev" target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href="HTTP://svelte.dev" target="_blank">svelte website (invalid)</a>
+<a href="HTTP://svelte.dev" target="_blank" rel="">svelte website (invalid)</a>
+<a href="HTTP://svelte.dev" target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href={'HTTPS://svelte.dev'} target="_blank">svelte website (invalid)</a>
+<a href={'HTTPS://svelte.dev'} target="_blank" rel="">svelte website (invalid)</a>
+<a href={'HTTPS://svelte.dev'} target="_blank" rel="noopener">svelte website (invalid)</a>
+<a href="same-host" target="_blank">Same host (valid)</a>
+<a href="same-host" target="_blank" rel="">Same host (valid)</a>
+<a href="same-host" target="_blank" rel="noopener">Same host (valid)</a>
+<a href="http://svelte.dev" target="_blank" rel="noreferrer">svelte website (valid)</a>
+<a href="http://svelte.dev" target="_blank" rel="noreferrer noopener">svelte website (valid)</a>
+<a href="HTTP://svelte.dev" target="_blank" rel="noreferrer">svelte website (valid)</a>
+<a href="HTTP://svelte.dev" target="_blank" rel="noreferrer noopener">svelte website (valid)</a>
+<a href="https://svelte.dev" target="_blank" rel="noreferrer">svelte website (valid)</a>
+<a href="https://svelte.dev" target="_blank" rel="noreferrer noopener">svelte website (valid)</a>
+<a href="HTTPS://svelte.dev" target="_blank" rel="noreferrer">svelte website (valid)</a>
+<a href="HTTPS://svelte.dev" target="_blank" rel="noreferrer noopener">svelte website (valid)</a>
+<a href="//svelte.dev" target="_blank" rel="noreferrer">svelte website (valid)</a>
+<a href="//svelte.dev" target="_blank" rel="noreferrer noopener">svelte website (valid)</a>
+<!-- dynamic rel value should not warn-->
+<a href="//svelte.dev" target="_blank" rel={`${Math.random()}`}>svelte website (valid)</a>
diff --git a/test/validator/samples/security-anchor-rel-noopener-legacy/warnings.json b/test/validator/samples/security-anchor-rel-noopener-legacy/warnings.json
new file mode 100644
index 0000000000..24c10fb763
--- /dev/null
+++ b/test/validator/samples/security-anchor-rel-noopener-legacy/warnings.json
@@ -0,0 +1,272 @@
+[
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 73,
+			"column": 73,
+			"line": 1
+		},
+		"pos": 0,
+		"start": {
+			"character": 0,
+			"column": 0,
+			"line": 1
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 154,
+			"column": 80,
+			"line": 2
+		},
+		"pos": 74,
+		"start": {
+			"character": 74,
+			"column": 0,
+			"line": 2
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 243,
+			"column": 88,
+			"line": 3
+		},
+		"pos": 155,
+		"start": {
+			"character": 155,
+			"column": 0,
+			"line": 3
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 319,
+			"column": 75,
+			"line": 4
+		},
+		"pos": 244,
+		"start": {
+			"character": 244,
+			"column": 0,
+			"line": 4
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 402,
+			"column": 82,
+			"line": 5
+		},
+		"pos": 320,
+		"start": {
+			"character": 320,
+			"column": 0,
+			"line": 5
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 493,
+			"column": 90,
+			"line": 6
+		},
+		"pos": 403,
+		"start": {
+			"character": 403,
+			"column": 0,
+			"line": 6
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 561,
+			"column": 67,
+			"line": 7
+		},
+		"pos": 494,
+		"start": {
+			"character": 494,
+			"column": 0,
+			"line": 7
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 636,
+			"column": 74,
+			"line": 8
+		},
+		"pos": 562,
+		"start": {
+			"character": 562,
+			"column": 0,
+			"line": 8
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 719,
+			"column": 82,
+			"line": 9
+		},
+		"pos": 637,
+		"start": {
+			"character": 637,
+			"column": 0,
+			"line": 9
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 792,
+			"column": 72,
+			"line": 10
+		},
+		"pos": 720,
+		"start": {
+			"character": 720,
+			"column": 0,
+			"line": 10
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 872,
+			"column": 79,
+			"line": 11
+		},
+		"pos": 793,
+		"start": {
+			"character": 793,
+			"column": 0,
+			"line": 11
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 960,
+			"column": 87,
+			"line": 12
+		},
+		"pos": 873,
+		"start": {
+			"character": 873,
+			"column": 0,
+			"line": 12
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1033,
+			"column": 72,
+			"line": 13
+		},
+		"pos": 961,
+		"start": {
+			"character": 961,
+			"column": 0,
+			"line": 13
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1113,
+			"column": 79,
+			"line": 14
+		},
+		"pos": 1034,
+		"start": {
+			"character": 1034,
+			"column": 0,
+			"line": 14
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1201,
+			"column": 87,
+			"line": 15
+		},
+		"pos": 1114,
+		"start": {
+			"character": 1114,
+			"column": 0,
+			"line": 15
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1277,
+			"column": 75,
+			"line": 16
+		},
+		"pos": 1202,
+		"start": {
+			"character": 1202,
+			"column": 0,
+			"line": 16
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1360,
+			"column": 82,
+			"line": 17
+		},
+		"pos": 1278,
+		"start": {
+			"character": 1278,
+			"column": 0,
+			"line": 17
+		}
+	},
+	{
+		"code": "security-anchor-rel-noreferrer",
+		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noreferrer\"",
+		"end": {
+			"character": 1451,
+			"column": 90,
+			"line": 18
+		},
+		"pos": 1361,
+		"start": {
+			"character": 1361,
+			"column": 0,
+			"line": 18
+		}
+	}
+]
diff --git a/test/validator/samples/security-anchor-rel-noopener/warnings.json b/test/validator/samples/security-anchor-rel-noopener/warnings.json
index 5a59064a0a..fe51488c70 100644
--- a/test/validator/samples/security-anchor-rel-noopener/warnings.json
+++ b/test/validator/samples/security-anchor-rel-noopener/warnings.json
@@ -1,272 +1 @@
-[
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 73,
-			"column": 73,
-			"line": 1
-		},
-		"pos": 0,
-		"start": {
-			"character": 0,
-			"column": 0,
-			"line": 1
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 154,
-			"column": 80,
-			"line": 2
-		},
-		"pos": 74,
-		"start": {
-			"character": 74,
-			"column": 0,
-			"line": 2
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 243,
-			"column": 88,
-			"line": 3
-		},
-		"pos": 155,
-		"start": {
-			"character": 155,
-			"column": 0,
-			"line": 3
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 319,
-			"column": 75,
-			"line": 4
-		},
-		"pos": 244,
-		"start": {
-			"character": 244,
-			"column": 0,
-			"line": 4
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 402,
-			"column": 82,
-			"line": 5
-		},
-		"pos": 320,
-		"start": {
-			"character": 320,
-			"column": 0,
-			"line": 5
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 493,
-			"column": 90,
-			"line": 6
-		},
-		"pos": 403,
-		"start": {
-			"character": 403,
-			"column": 0,
-			"line": 6
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 561,
-			"column": 67,
-			"line": 7
-		},
-		"pos": 494,
-		"start": {
-			"character": 494,
-			"column": 0,
-			"line": 7
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 636,
-			"column": 74,
-			"line": 8
-		},
-		"pos": 562,
-		"start": {
-			"character": 562,
-			"column": 0,
-			"line": 8
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 719,
-			"column": 82,
-			"line": 9
-		},
-		"pos": 637,
-		"start": {
-			"character": 637,
-			"column": 0,
-			"line": 9
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 792,
-			"column": 72,
-			"line": 10
-		},
-		"pos": 720,
-		"start": {
-			"character": 720,
-			"column": 0,
-			"line": 10
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 872,
-			"column": 79,
-			"line": 11
-		},
-		"pos": 793,
-		"start": {
-			"character": 793,
-			"column": 0,
-			"line": 11
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 960,
-			"column": 87,
-			"line": 12
-		},
-		"pos": 873,
-		"start": {
-			"character": 873,
-			"column": 0,
-			"line": 12
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1033,
-			"column": 72,
-			"line": 13
-		},
-		"pos": 961,
-		"start": {
-			"character": 961,
-			"column": 0,
-			"line": 13
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1113,
-			"column": 79,
-			"line": 14
-		},
-		"pos": 1034,
-		"start": {
-			"character": 1034,
-			"column": 0,
-			"line": 14
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1201,
-			"column": 87,
-			"line": 15
-		},
-		"pos": 1114,
-		"start": {
-			"character": 1114,
-			"column": 0,
-			"line": 15
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1277,
-			"column": 75,
-			"line": 16
-		},
-		"pos": 1202,
-		"start": {
-			"character": 1202,
-			"column": 0,
-			"line": 16
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1360,
-			"column": 82,
-			"line": 17
-		},
-		"pos": 1278,
-		"start": {
-			"character": 1278,
-			"column": 0,
-			"line": 17
-		}
-	},
-	{
-		"code": "security-anchor-rel-noopener",
-		"message": "Security: Anchor with \"target=_blank\" should have rel attribute containing the value \"noopener\" or \"noreferrer\"",
-		"end": {
-			"character": 1451,
-			"column": 90,
-			"line": 18
-		},
-		"pos": 1361,
-		"start": {
-			"character": 1361,
-			"column": 0,
-			"line": 18
-		}
-	}
-]
+[]