From 97065b2e68dd8768dc1ea092c893c57ebe205026 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Thu, 25 Feb 2021 08:31:36 -0500
Subject: use class="hidden" not style="display:none"

---
 files/de/web/css/appearance/index.html | 216 ++++++++++++++++-----------------
 1 file changed, 108 insertions(+), 108 deletions(-)

(limited to 'files/de/web/css/appearance/index.html')

diff --git a/files/de/web/css/appearance/index.html b/files/de/web/css/appearance/index.html
index 12a67f3f60..62ee89682e 100644
--- a/files/de/web/css/appearance/index.html
+++ b/files/de/web/css/appearance/index.html
@@ -50,7 +50,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>none</code></td>
    <td>
-    <div id="sampleNone" style="display: none;">
+    <div id="sampleNone" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: none; -webkit-appearance: none; color: black;}</pre>
 
@@ -64,7 +64,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button</code></td>
    <td>
-    <div id="sampleButton" style="display: none;">
+    <div id="sampleButton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button; -webkit-appearance: button; color: black; }</pre>
 
@@ -77,7 +77,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-arrow-down</code></td>
    <td>
-    <div id="sampleButtonArrowDown" style="display: none;">
+    <div id="sampleButtonArrowDown" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-arrow-down; -webkit-appearance: button-arrow-down; color: black; }</pre>
 
@@ -90,7 +90,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-arrow-next</code></td>
    <td>
-    <div id="sampleButtonArrowNext" style="display: none;">
+    <div id="sampleButtonArrowNext" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-arrow-next; -webkit-appearance: button-arrow-next; color: black; }</pre>
 
@@ -103,7 +103,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-arrow-previous</code></td>
    <td>
-    <div id="sampleButtonArrowPrevious" style="display: none;">
+    <div id="sampleButtonArrowPrevious" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-arrow-previous; -webkit-appearance: button-arrow-previous; color: black; }</pre>
 
@@ -116,7 +116,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-arrow-up</code></td>
    <td>
-    <div id="sampleButtonArrowUp" style="display: none;">
+    <div id="sampleButtonArrowUp" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-arrow-up; -webkit-appearance: button-arrow-up; color: black; }</pre>
 
@@ -129,7 +129,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-bevel</code></td>
    <td>
-    <div id="sampleButtonBevel" style="display: none;">
+    <div id="sampleButtonBevel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-bevel; -webkit-appearance: button-bevel; color: black; }</pre>
 
@@ -142,7 +142,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>button-focus</code></td>
    <td>
-    <div id="sampleButtonFocus" style="display: none;">
+    <div id="sampleButtonFocus" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: button-focus; -webkit-appearance: button-focus; color: black; }</pre>
 
@@ -155,7 +155,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>caret</code></td>
    <td>
-    <div id="sampleCaret" style="display: none;">
+    <div id="sampleCaret" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: caret; -webkit-appearance: caret; color: black; }</pre>
 
@@ -168,7 +168,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>checkbox</code></td>
    <td>
-    <div id="sampleCheckbox" style="display: none;">
+    <div id="sampleCheckbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: checkbox; -webkit-appearance: checkbox; color: black; }</pre>
 
@@ -181,7 +181,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>checkbox-container</code></td>
    <td>
-    <div id="sampleCheckboxContainer" style="display: none;">
+    <div id="sampleCheckboxContainer" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: checkbox-container; -webkit-appearance: checkbox-container; color: black; }</pre>
 
@@ -194,7 +194,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>checkbox-label</code></td>
    <td>
-    <div id="sampleCheckboxLabel" style="display: none;">
+    <div id="sampleCheckboxLabel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: checkbox-label; -webkit-appearance: checkbox-label; color: black; }</pre>
 
@@ -207,7 +207,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>checkmenuitem</code></td>
    <td>
-    <div id="sampleCheckmenuitem" style="display: none;">
+    <div id="sampleCheckmenuitem" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: checkmenuitem; -webkit-appearance: checkmenuitem; height: 20px; color: black; }</pre>
 
@@ -220,7 +220,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>dualbutton</code></td>
    <td>
-    <div id="sampleDualButton" style="display: none;">
+    <div id="sampleDualButton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: dualbutton; -webkit-appearance: dualbutton; color: black; }</pre>
 
@@ -233,7 +233,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>groupbox</code></td>
    <td>
-    <div id="sampleGroupbox" style="display: none;">
+    <div id="sampleGroupbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: groupbox; -webkit-appearance: groupbox; color: black; }</pre>
 
@@ -246,7 +246,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>listbox</code></td>
    <td>
-    <div id="sampleListBox" style="display: none;">
+    <div id="sampleListBox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: listbox; -webkit-appearance: listbox; height:20px; color: black; }</pre>
 
@@ -259,7 +259,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>listitem</code></td>
    <td>
-    <div id="sampleListItem" style="display: none;">
+    <div id="sampleListItem" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: listitem; -webkit-appearance: listitem; color: black; }</pre>
 
@@ -272,7 +272,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuarrow</code></td>
    <td>
-    <div id="sampleMenuArrow" style="display: none;">
+    <div id="sampleMenuArrow" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuarrow; -webkit-appearance: menuarrow; color: black; }</pre>
 
@@ -285,7 +285,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menubar</code></td>
    <td>
-    <div id="sampleMenubar" style="display: none;">
+    <div id="sampleMenubar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menubar; -webkit-appearance: menubar; color: balck; }</pre>
 
@@ -298,7 +298,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menucheckbox</code></td>
    <td>
-    <div id="sampleMenuCheckbox" style="display: none;">
+    <div id="sampleMenuCheckbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menucheckbox; -webkit-appearance: menucheckbox; color: black; }</pre>
 
@@ -311,7 +311,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuimage</code></td>
    <td>
-    <div id="sampleMenuImage" style="display: none;">
+    <div id="sampleMenuImage" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuimage; -webkit-appearance: menuimage; color: black; }</pre>
 
@@ -324,7 +324,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuitem</code></td>
    <td>
-    <div id="sampleMenuItem" style="display: none;">
+    <div id="sampleMenuItem" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuitem; -webkit-appearance: menuitem; color: black; }</pre>
 
@@ -337,7 +337,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuitemtext</code></td>
    <td>
-    <div id="sampleMenuItemText" style="display: none;">
+    <div id="sampleMenuItemText" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuitemtext; -webkit-appearance: menuitemtext; color: black; }</pre>
 
@@ -350,7 +350,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menulist</code></td>
    <td>
-    <div id="sampleMenuList" style="display: none;">
+    <div id="sampleMenuList" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menulist; -webkit-appearance: menulist; color: black; }</pre>
 
@@ -363,7 +363,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menulist-button</code></td>
    <td>
-    <div id="sampleMenuListButton" style="display: none;">
+    <div id="sampleMenuListButton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menulist-button; -webkit-appearance: menulist-button; color: black; }</pre>
 
@@ -376,7 +376,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menulist-text</code></td>
    <td>
-    <div id="sampleMenuListText" style="display: none;">
+    <div id="sampleMenuListText" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menulist-text; -webkit-appearance: menulist-text; color: black; }</pre>
 
@@ -389,7 +389,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menulist-textfield</code></td>
    <td>
-    <div id="sampleMenuListTextfield" style="display: none;">
+    <div id="sampleMenuListTextfield" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menulist-textfield; -webkit-appearance: menulist-textfield; color: black; }</pre>
 
@@ -402,7 +402,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menupopup</code></td>
    <td>
-    <div id="sampleMenuPopup" style="display: none;">
+    <div id="sampleMenuPopup" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menupopup; -webkit-appearance: menupopup; color: black; }</pre>
 
@@ -415,7 +415,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuradio</code></td>
    <td>
-    <div id="sampleMenuRadio" style="display: none;">
+    <div id="sampleMenuRadio" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuradio; -webkit-appearance: menuradio; color: black; }</pre>
 
@@ -428,7 +428,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>menuseparator</code></td>
    <td>
-    <div id="sampleMenuSeparator" style="display: none;">
+    <div id="sampleMenuSeparator" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: menuseparator; -webkit-appearance: menuseparator; color: transparent; }</pre>
 
@@ -441,7 +441,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>meterbar</code></td>
    <td>
-    <div id="sampleMeterbar" style="display: none;">
+    <div id="sampleMeterbar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: meterbar; -webkit-appearance: meterbar; color: black; }</pre>
 
@@ -454,7 +454,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>meterchunk</code></td>
    <td>
-    <div id="sampleMeterchunk" style="display: none;">
+    <div id="sampleMeterchunk" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: meterchunk; -webkit-appearance: meterchunk; color: black; }</pre>
 
@@ -467,7 +467,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>progressbar</code></td>
    <td>
-    <div id="sampleProgressBar" style="display: none;">
+    <div id="sampleProgressBar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: progressbar; -webkit-appearance: progressbar; color: black; }</pre>
 
@@ -480,7 +480,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>progressbar-vertical</code></td>
    <td>
-    <div id="sampleProgressBarVertical" style="display: none;">
+    <div id="sampleProgressBarVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: progressbar-vertical; -webkit-appearance: preogressbar-vertical; color: transparent; }</pre>
 
@@ -493,7 +493,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>progresschunk</code></td>
    <td>
-    <div id="sampleProgressChunk" style="display: none;">
+    <div id="sampleProgressChunk" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: progresschunk; -webkit-appearance: progresschunk; color: black; }</pre>
 
@@ -506,7 +506,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>progresschunk-vertical</code></td>
    <td>
-    <div id="sampleProgressChunkVertical" style="display: none;">
+    <div id="sampleProgressChunkVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: progresschunk-vertical; -webkit-appearance: progresschunk-vertical; color: black; }</pre>
 
@@ -519,7 +519,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>radio</code></td>
    <td>
-    <div id="sampleRadio" style="display: none;">
+    <div id="sampleRadio" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: radio; -webkit-appearance: radio; color: black; }</pre>
 
@@ -532,7 +532,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>radio-container</code></td>
    <td>
-    <div id="sampleRadioContainer" style="display: none;">
+    <div id="sampleRadioContainer" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: radio-container; -webkit-appearance: radio-container; color: black; }</pre>
 
@@ -545,7 +545,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>radio-label</code></td>
    <td>
-    <div id="sampleRadioLabel" style="display: none;">
+    <div id="sampleRadioLabel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: radio-label; -webkit-appearance: radio-label; color: black; }</pre>
 
@@ -558,7 +558,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>radiomenuitem</code></td>
    <td>
-    <div id="sampleRadioMenuItem" style="display: none;">
+    <div id="sampleRadioMenuItem" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: radiomenuitem; -webkit-appearance: radiomenuitem; color: black; }</pre>
 
@@ -571,7 +571,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>resizer</code></td>
    <td>
-    <div id="sampleResizer" style="display: none;">
+    <div id="sampleResizer" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: resizer; -webkit-appearance: resizer; color: transparent; }</pre>
 
@@ -584,7 +584,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>resizerpanel</code></td>
    <td>
-    <div id="sampleResizerPanel" style="display: none;">
+    <div id="sampleResizerPanel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: resizerpanel; -webkit-appearance: resizerpanel; color: black; }</pre>
 
@@ -597,7 +597,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scale-horizontal</code></td>
    <td>
-    <div id="sampleScaleHorizontal" style="display: none;">
+    <div id="sampleScaleHorizontal" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scale-horizontal; -webkit-appearance: scale-horizontal; color: transparent; }</pre>
 
@@ -610,7 +610,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scalethumbend</code></td>
    <td>
-    <div id="sampleThumbEnd" style="display: none;">
+    <div id="sampleThumbEnd" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scalethumbend; -webkit-appearance: scalethumbend; color: black; }</pre>
 
@@ -623,7 +623,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scalethumb-horizontal</code></td>
    <td>
-    <div id="sampleScaleThumbHorizontal" style="display: none;">
+    <div id="sampleScaleThumbHorizontal" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scalethumb-horizontal; -webkit-appearance: scalethumb-horizontal; color: transparent; }</pre>
 
@@ -636,7 +636,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scalethumbstart</code></td>
    <td>
-    <div id="sampleScaleThumbStart" style="display: none;">
+    <div id="sampleScaleThumbStart" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scalethumbstart; -webkit-appearance: scalethumbstart; color: black; }</pre>
 
@@ -649,7 +649,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scalethumbtick</code></td>
    <td>
-    <div id="sampleScaleThumbTick" style="display: none;">
+    <div id="sampleScaleThumbTick" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scalethumbtick; -webkit-appearance: scalethumbtick; color: black; }</pre>
 
@@ -662,7 +662,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scalethumb-vertical</code></td>
    <td>
-    <div id="sampleScaleThumbVertical" style="display: none;">
+    <div id="sampleScaleThumbVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scalethumb-vertical; -webkit-appearance: scalethumb-vertical; color: black; }</pre>
 
@@ -675,7 +675,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scale-vertical</code></td>
    <td>
-    <div id="sampleScaleVertical" style="display: none;">
+    <div id="sampleScaleVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scale-vertical; -webkit-appearance: scale-vertical; color: transparent; }</pre>
 
@@ -688,7 +688,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarbutton-down</code></td>
    <td>
-    <div id="sampleScrollbarButtonDown" style="display: none;">
+    <div id="sampleScrollbarButtonDown" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarbutton-down; -webkit-appearance: scrollbarbutton-down; color: black; }</pre>
 
@@ -701,7 +701,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarbutton-left</code></td>
    <td>
-    <div id="sampleScrollbarButtonLeft" style="display: none;">
+    <div id="sampleScrollbarButtonLeft" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarbutton-left; -webkit-appearance: scrollbarbutton-left; color: black; }</pre>
 
@@ -714,7 +714,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarbutton-right</code></td>
    <td>
-    <div id="sampleScrollbarButtonRight" style="display: none;">
+    <div id="sampleScrollbarButtonRight" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarbutton-right; -webkit-appearance: scrollbarbutton-right; color: black; }</pre>
 
@@ -727,7 +727,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarbutton-up</code></td>
    <td>
-    <div id="sampleScrollbarButtonUp" style="display: none;">
+    <div id="sampleScrollbarButtonUp" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarbutton-up; -webkit-appearance: scrollbarbutton-up; color: black; }</pre>
 
@@ -740,7 +740,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarthumb-horizontal</code></td>
    <td>
-    <div id="sampleScrollbarThumbHorizontal" style="display: none;">
+    <div id="sampleScrollbarThumbHorizontal" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarthumb-horizontal; -webkit-appearance: scrollbarthumb-horizontal; color: black; }</pre>
 
@@ -753,7 +753,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbarthumb-vertical</code></td>
    <td>
-    <div id="sampleScrollbarThumbVertical" style="display: none;">
+    <div id="sampleScrollbarThumbVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbarthumb-vertical; -webkit-appearance: scrollbarthumb-vertical; color: black; }</pre>
 
@@ -766,7 +766,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbartrack-horizontal</code></td>
    <td>
-    <div id="sampleScrollbarTrackHorizontal" style="display: none;">
+    <div id="sampleScrollbarTrackHorizontal" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbartrack-horizontal; -webkit-appearance: scrollbartrack-horizontal; color: black; }</pre>
 
@@ -779,7 +779,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>scrollbartrack-vertical</code></td>
    <td>
-    <div id="sampleScrollbarTrackVertical" style="display: none;">
+    <div id="sampleScrollbarTrackVertical" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: scrollbartrack-vertical; -webkit-appearance: scrollbarbartrack-vertical; color: black; }</pre>
 
@@ -792,7 +792,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>searchfield</code></td>
    <td>
-    <div id="sampleSearchField" style="display: none;">
+    <div id="sampleSearchField" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: searchfield; -webkit-appearance: searchfield; color: black; }</pre>
 
@@ -805,7 +805,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>separator</code></td>
    <td>
-    <div id="sampleSeparator" style="display: none;">
+    <div id="sampleSeparator" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: separator; -webkit-appearance: separator; color: transparent; }</pre>
 
@@ -818,7 +818,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>sheet</code></td>
    <td>
-    <div id="sampleSheet" style="display: none;">
+    <div id="sampleSheet" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: sheet; -webkit-appearance: sheet; color: black; }</pre>
 
@@ -831,7 +831,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>spinner</code></td>
    <td>
-    <div id="sampleSpinner" style="display: none;">
+    <div id="sampleSpinner" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: spinner; -webkit-appearance: spinner; color: transparent; }</pre>
 
@@ -844,7 +844,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>spinner-downbutton</code></td>
    <td>
-    <div id="sampleSpinnerDownbutton" style="display: none;">
+    <div id="sampleSpinnerDownbutton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: spinner-downbutton; -webkit-appearance: spinner-downbutton; color: black; }</pre>
 
@@ -857,7 +857,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>spinner-textfield</code></td>
    <td>
-    <div id="sampleSpinnerTextfield" style="display: none;">
+    <div id="sampleSpinnerTextfield" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: spinner-textfield; -webkit-appearance: spinner-textfield; color: black; }</pre>
 
@@ -870,7 +870,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>spinner-upbutton</code></td>
    <td>
-    <div id="sampleSpinnerUpbutton" style="display: none;">
+    <div id="sampleSpinnerUpbutton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: spinner-upbutton; -webkit-appearance: spinner-upbutton; color: black; }</pre>
 
@@ -883,7 +883,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>splitter</code></td>
    <td>
-    <div id="sampleSplitter" style="display: none;">
+    <div id="sampleSplitter" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: splitter; -webkit-appearance: splitter; color: transparent; }</pre>
 
@@ -896,7 +896,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>statusbar</code></td>
    <td>
-    <div id="sampleStatusBar" style="display: none;">
+    <div id="sampleStatusBar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: statusbar; -webkit-appearance: statusbar; color: black; }</pre>
 
@@ -909,7 +909,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>statusbarpanel</code></td>
    <td>
-    <div id="sampleStatusBarPanel" style="display: none;">
+    <div id="sampleStatusBarPanel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: statusbarpanel; -webkit-appearance: statusbarpanel; color: black; }</pre>
 
@@ -922,7 +922,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tab</code></td>
    <td>
-    <div id="sampleTab" style="display: none;">
+    <div id="sampleTab" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tab; -webkit-appearance: tab; height: 20px; color: black; }</pre>
 
@@ -935,7 +935,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tabpanel</code></td>
    <td>
-    <div id="sampleTabPanel" style="display: none;">
+    <div id="sampleTabPanel" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tabpanel; -webkit-appearance: tabpanel; color: black; }</pre>
 
@@ -948,7 +948,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tabpanels</code></td>
    <td>
-    <div id="sampleTabPanels" style="display: none;">
+    <div id="sampleTabPanels" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tabpanels; -webkit-appearance: tabpanels; color: black; }</pre>
 
@@ -961,7 +961,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tab-scroll-arrow-back</code></td>
    <td>
-    <div id="sampleTabScrollArrowBack" style="display: none;">
+    <div id="sampleTabScrollArrowBack" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tab-scroll-arrow-back; -webkit-appearance: tab-scroll-arrow-back; color: black; }</pre>
 
@@ -974,7 +974,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tab-scroll-arrow-forward</code></td>
    <td>
-    <div id="sampleTabScrollArrowForward" style="display: none;">
+    <div id="sampleTabScrollArrowForward" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tab-scroll-arrow-forward; -webkit-appearance: tab-scroll-arrow-forward; color: black; }</pre>
 
@@ -987,7 +987,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>textfield</code></td>
    <td>
-    <div id="sampleTextField" style="display: none;">
+    <div id="sampleTextField" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: textfield; -webkit-appearance: textfield; color: black; }</pre>
 
@@ -1000,7 +1000,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>textfield-multiline</code></td>
    <td>
-    <div id="sampleTextfieldMultiline" style="display: none;">
+    <div id="sampleTextfieldMultiline" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: textfield-multiline; -webkit-appearance: textfield-multiline; color: black; }</pre>
 
@@ -1013,7 +1013,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>toolbar</code></td>
    <td>
-    <div id="sampleToolbar" style="display: none;">
+    <div id="sampleToolbar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: toolbar; -webkit-appearance: toolbar; color: black; }</pre>
 
@@ -1026,7 +1026,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>toolbarbutton</code></td>
    <td>
-    <div id="sampleToolbarButton" style="display: none;">
+    <div id="sampleToolbarButton" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: toolbarbutton; -webkit-appearance: toolbarbutton; color: black; }</pre>
 
@@ -1039,7 +1039,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>toolbarbutton-dropdown</code></td>
    <td>
-    <div id="sampleToolbarButtonDropdown" style="display: none;">
+    <div id="sampleToolbarButtonDropdown" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: toolbarbutton-dropdown; -webkit-appearance: toolbarbutton-dropdown; color: black; }</pre>
 
@@ -1052,7 +1052,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>toolbargripper</code></td>
    <td>
-    <div id="sampleToolbarGripper" style="display: none;">
+    <div id="sampleToolbarGripper" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: toolbargripper; -webkit-appearance: toolbargripper; color: black; }</pre>
 
@@ -1065,7 +1065,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>toolbox</code></td>
    <td>
-    <div id="sampleToolbox" style="display: none;">
+    <div id="sampleToolbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: toolbox; -webkit-appearance: toolbox; color: black; }</pre>
 
@@ -1078,7 +1078,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>tooltip</code></td>
    <td>
-    <div id="sampleTooltip" style="display: none;">
+    <div id="sampleTooltip" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: tooltip; -webkit-appearance: tooltip; color: black; }</pre>
 
@@ -1091,7 +1091,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeheader</code></td>
    <td>
-    <div id="sampleTreeHeader" style="display: none;">
+    <div id="sampleTreeHeader" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeheader; -webkit-appearance: treeheader; color: black; }</pre>
 
@@ -1104,7 +1104,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeheadercell</code></td>
    <td>
-    <div id="sampleTreeHeaderCell" style="display: none;">
+    <div id="sampleTreeHeaderCell" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeheadercell; -webkit-appearance: treeheadercell; height:20px; color: black; }</pre>
 
@@ -1117,7 +1117,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeheadersortarrow</code></td>
    <td>
-    <div id="sampleTreeHeaderSortArrow" style="display: none;">
+    <div id="sampleTreeHeaderSortArrow" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeheadersortarrow; -webkit-appearance: treeheadersortarrow; color: black; }</pre>
 
@@ -1130,7 +1130,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeitem</code></td>
    <td>
-    <div id="sampleTreeItem" style="display: none;">
+    <div id="sampleTreeItem" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeitem; -webkit-appearance: treeitem; color: black; }</pre>
 
@@ -1143,7 +1143,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeline</code></td>
    <td>
-    <div id="sampleTreeLine" style="display: none;">
+    <div id="sampleTreeLine" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeline; -webkit-appearance: treeline; color: black; }</pre>
 
@@ -1156,7 +1156,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treetwisty</code></td>
    <td>
-    <div id="sampleTreeTwisty" style="display: none;">
+    <div id="sampleTreeTwisty" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treetwisty; -webkit-appearance: treetwisty; color: transparent; }</pre>
 
@@ -1169,7 +1169,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treetwistyopen</code></td>
    <td>
-    <div id="sampleTreeTwistyOpen" style="display: none;">
+    <div id="sampleTreeTwistyOpen" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treetwistyopen; -webkit-appearance: treetwistyopen; color: transparent; }</pre>
 
@@ -1182,7 +1182,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>treeview</code></td>
    <td>
-    <div id="sampleTreeView" style="display: none;">
+    <div id="sampleTreeView" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: treeview; -webkit-appearance: treeview; color: black; }</pre>
 
@@ -1195,7 +1195,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-mac-unified-toolbar</code></td>
    <td>
-    <div id="sampleMacUnifiedToolbar" style="display: none;">
+    <div id="sampleMacUnifiedToolbar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-mac-unified-toolbar; color: black; }</pre>
 
@@ -1208,7 +1208,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td>{{ gecko_minversion_inline("2.0") }} <code>-moz-win-borderless-glass</code></td>
    <td>
-    <div id="sampleWinBorderlessGlass" style="display: none;">
+    <div id="sampleWinBorderlessGlass" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-borderless-glass; color: black; }</pre>
 
@@ -1221,7 +1221,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-browsertabbar-toolbox</code></td>
    <td>
-    <div id="sampleWinBrowsertabbarToolbox" style="display: none;">
+    <div id="sampleWinBrowsertabbarToolbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-browsertabbar-toolbox; color: black; }</pre>
 
@@ -1234,7 +1234,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-communicationstext</code></td>
    <td>
-    <div id="sampleWinCommunicationstext" style="display: none;">
+    <div id="sampleWinCommunicationstext" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-communicationstext; color: black; }</pre>
 
@@ -1247,7 +1247,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-communications-toolbox</code></td>
    <td>
-    <div id="sampleWinCommunicationsToolbox" style="display: none;">
+    <div id="sampleWinCommunicationsToolbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-communications-toolbox; color: black; }</pre>
 
@@ -1260,7 +1260,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td>{{gecko_minversion_inline("6.0")}} <code>-moz-win-exclude-glass</code></td>
    <td>
-    <div id="sampleWinExcludeGlass" style="display: none;">
+    <div id="sampleWinExcludeGlass" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-exclude-glass; color: black; }</pre>
 
@@ -1273,7 +1273,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-glass</code></td>
    <td>
-    <div id="sampleWinGlass" style="display: none;">
+    <div id="sampleWinGlass" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-glass; color: black; }</pre>
 
@@ -1286,7 +1286,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-mediatext</code></td>
    <td>
-    <div id="sampleWinMediaText" style="display: none;">
+    <div id="sampleWinMediaText" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-mediatext; color: black; }</pre>
 
@@ -1299,7 +1299,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-win-media-toolbox</code></td>
    <td>
-    <div id="sampleWinMediaToolbox" style="display: none;">
+    <div id="sampleWinMediaToolbox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-win-media-toolbox; color: black; }</pre>
 
@@ -1312,7 +1312,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-box</code></td>
    <td>
-    <div id="sampleWindowButtonBox" style="display: none;">
+    <div id="sampleWindowButtonBox" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-box; color: black; }</pre>
 
@@ -1325,7 +1325,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-box-maximized</code></td>
    <td>
-    <div id="sampleWindowButtonBoxMaximized" style="display: none;">
+    <div id="sampleWindowButtonBoxMaximized" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-box-maximized; color: black; }</pre>
 
@@ -1338,7 +1338,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-close</code></td>
    <td>
-    <div id="sampleWindowButtonClose" style="display: none;">
+    <div id="sampleWindowButtonClose" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-close; color: black; }</pre>
 
@@ -1351,7 +1351,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-maximize</code></td>
    <td>
-    <div id="sampleWindowButtonMaximize" style="display: none;">
+    <div id="sampleWindowButtonMaximize" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-maximize; color: black; }</pre>
 
@@ -1364,7 +1364,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-minimize</code></td>
    <td>
-    <div id="sampleWindowButtonMinimize" style="display: none;">
+    <div id="sampleWindowButtonMinimize" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-minimize; color: black; }</pre>
 
@@ -1377,7 +1377,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-button-restore</code></td>
    <td>
-    <div id="sampleWindowButtonRestore" style="display: none;">
+    <div id="sampleWindowButtonRestore" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-button-restore; color: black; }</pre>
 
@@ -1390,7 +1390,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-frame-bottom</code></td>
    <td>
-    <div id="sampleWindowFrameBottom" style="display: none;">
+    <div id="sampleWindowFrameBottom" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-frame-bottom; color: black; }</pre>
 
@@ -1403,7 +1403,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-frame-left</code></td>
    <td>
-    <div id="sampleWindowFrameLeft" style="display: none;">
+    <div id="sampleWindowFrameLeft" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-frame-left; color: black; }</pre>
 
@@ -1416,7 +1416,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-frame-right</code></td>
    <td>
-    <div id="sampleWindowFrameRight" style="display: none;">
+    <div id="sampleWindowFrameRight" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-frame-right; color: black; }</pre>
 
@@ -1429,7 +1429,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-titlebar</code></td>
    <td>
-    <div id="sampleWindowTitlebar" style="display: none;">
+    <div id="sampleWindowTitlebar" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-titlebar; color: black; }</pre>
 
@@ -1442,7 +1442,7 @@ translation_of: Web/CSS/appearance
   <tr>
    <td><code>-moz-window-titlebar-maximized</code></td>
    <td>
-    <div id="sampleWindowTitlebarMaximized" style="display: none;">
+    <div id="sampleWindowTitlebarMaximized" class="hidden">
     <pre class="brush:css">
  div {-moz-appearance: -moz-window-titlebar-maximized; color: black; }</pre>
 
-- 
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