More <message-dialog> fixes.

resources/report/css/style.css

@@ -178,14 +178,14 @@ dialog {
 dialog > h1 {
     margin: 0;
     margin-bottom: 1em;
-    text-align: center;
     font-weight: normal;
+    display: inline-block;
 }
 dialog > span:first-child {
     font-size: 4em;
-    position: absolute;
-    left: 1em;
-    top: 23px;
+    position: relative;
+    margin-right: 0.5em;
+    top: 0.2em;
 }
 dialog[data-type=warn] > span:first-child  {
     color: gold;

resources/report/js/custom.js

@@ -93,8 +93,6 @@ var messageDialogProto = Object.create(HTMLDialogElement.prototype, {
         /* A type of 'error' or 'info' produces an 'OK'-only dialog box. */
         value: function(type, title, text, onClose) {
 
-            this.setAttribute('data-type', type);
-
             this.querySelector('h1').textContent = title;
             this.querySelector('p').textContent = text;
 
@@ -103,7 +101,7 @@ var messageDialogProto = Object.create(HTMLDialogElement.prototype, {
 
             if (type == 'error' || type == 'info') {
                 this.querySelector('.accept').textContent = 'OK';
-                hideElement(this.querySelector('.cancel'));
+                this.querySelector('.cancel').style.display = 'hidden';
             }
 
             HTMLDialogElement.prototype.showModal.call(this);