Need to test quirks mode for <option label> too
https://github.com/whatwg/html/issues/2988 for context.
diff --git a/html/rendering/widgets/the-select-element/option-add-label-quirks.html b/html/rendering/widgets/the-select-element/option-add-label-quirks.html
new file mode 100644
index 0000000..2c3c809
--- /dev/null
+++ b/html/rendering/widgets/the-select-element/option-add-label-quirks.html
@@ -0,0 +1,20 @@
+<meta charset="utf-8">
+<title>OPTION's label attribute in SELECT -- Adding a label (quirks)</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-select-element-2">
+<link rel="match" href="option-label-ref.html">
+<meta name="assert" content="An option element is expected to be rendered by displaying the element's label.">
+
+<select>
+ <option>Element Text</option>
+</select>
+<br/>
+<select size="4">
+ <option>Element Text</option>
+</select>
+<script>
+let options = document.querySelectorAll("option");
+options[0].getBoundingClientRect(); // force layout.
+for (let option of options) {
+ option.setAttribute("label", "Label Text");
+}
+</script>
