Tests: Add the hidden-img hack to a couple of flaky tests

AtkinsSJ · AtkinsSJ · commit d9ed784f921f · 2025-09-25T10:35:28.000+01:00
Editing a WPT import feels wrong because fixing the bug would be better,
but flaky CI helps nobody.
diff --git a/Tests/LibWeb/Ref/input/wpt-import/css/filter-effects/effect-reference-feimage-001.html b/Tests/LibWeb/Ref/input/wpt-import/css/filter-effects/effect-reference-feimage-001.html
@@ -17,3 +17,6 @@
      <feimage xlink:href="support/color-palette.png"/>
   </filter>
 </svg>
+
+<!-- HACK: Force the document to wait for the image to load -->
+<img src="support/color-palette.png" style="opacity: 0"/>
diff --git a/Tests/LibWeb/Screenshot/input/css-background-blob-url.html b/Tests/LibWeb/Screenshot/input/css-background-blob-url.html
@@ -13,6 +13,9 @@
     </head>
     <body>
         <div id="background"></div>
+        
+        <!-- HACK: Force the document to wait for the image to load -->
+        <img src="../data/smiley.png" style="opacity: 0"/>
 
         <script>
             fetch("../data/smiley.png")
