drop-down select is display: inline-block

source

@@ -115666,8 +115666,8 @@ details[open] > summary {
 
   <p>A <code>select</code> element whose <code data-x="attr-select-multiple">multiple</code>
   attribute is absent, and whose <span data-x="concept-select-size">display size</span> is 1, is
-  expected to render as a one-line <span>drop-down box</span> whose width is the <span>width of the
-  <code>select</code>'s labels</span>.</p>
+  expected to render as an <span>'inline-block'</span> one-line <span>drop-down box</span> whose
+  width is the <span>width of the <code>select</code>'s labels</span>.</p>
 
   <p>In either case (<span>list box</span> or <span>drop-down box</span>), the element's items are
   expected to be the element's <span data-x="concept-select-option-list">list of options</span>,