--- a/mrjunejune/test/latex_editor_test.js	Mon Aug 03 18:23:36 2026 -0700
+++ b/mrjunejune/test/latex_editor_test.js	Mon Aug 03 18:30:45 2026 -0700
@@ -227,6 +227,23 @@
     await page.locator('#latexStatus[data-state="ready"]').waitFor({
       timeout: 15000,
     });
+    const editorAppearance = await page.locator('#latexSource').evaluate(element => {
+      const style = getComputedStyle(element);
+      const bounds = element.getBoundingClientRect();
+      return {
+        background: style.backgroundColor,
+        color: style.color,
+        display: style.display,
+        height: bounds.height,
+        value: element.value,
+        width: bounds.width,
+      };
+    });
+    assert.equal(editorAppearance.display, 'block');
+    assert.ok(editorAppearance.width > 300, JSON.stringify(editorAppearance));
+    assert.ok(editorAppearance.height > 400, JSON.stringify(editorAppearance));
+    assert.notEqual(editorAppearance.background, editorAppearance.color);
+    assert.match(editorAppearance.value, /\\documentclass/);
     assert.match(
       await page.locator('#pdfPreview').getAttribute('src'),
       /^blob:/,