diff --git a/frontend/src/components/dirent-list-view/dirent-list-item.js b/frontend/src/components/dirent-list-view/dirent-list-item.js
index 15df1657e8..c1d4ee78a2 100644
--- a/frontend/src/components/dirent-list-view/dirent-list-item.js
+++ b/frontend/src/components/dirent-list-view/dirent-list-item.js
@@ -727,7 +727,7 @@ class DirentListItem extends React.Component {
         onContextMenu={this.onItemContextMenu}
       >
         <td className={`pl10 ${this.state.isDragTipShow ? 'tr-drag-effect' : ''}`}>
-          <input type="checkbox" className="vam" onChange={this.onItemSelected} checked={dirent.isSelected}/>
+          <input type="checkbox" className="vam" onChange={this.onItemSelected} checked={dirent.isSelected} aria-label={dirent.isSelected ?gettext('Unselect this item') : gettext('Select this item')} />
         </td>
         <td className="pl10">
           {dirent.starred !== undefined &&
diff --git a/frontend/src/components/dirent-list-view/dirent-list-view.js b/frontend/src/components/dirent-list-view/dirent-list-view.js
index 6db555aa33..f460b74d72 100644
--- a/frontend/src/components/dirent-list-view/dirent-list-view.js
+++ b/frontend/src/components/dirent-list-view/dirent-list-view.js
@@ -619,7 +619,7 @@ class DirentListView extends React.Component {
             <thead onMouseDown={this.onThreadMouseDown} onContextMenu={this.onThreadContextMenu}>
               <tr>
                 <th width="3%" className="pl10">
-                  <input type="checkbox" className="vam" onChange={this.props.onAllItemSelected} checked={this.props.isAllItemSelected} />
+                  <input type="checkbox" className="vam" onChange={this.props.onAllItemSelected} checked={this.props.isAllItemSelected} aria-label={this.props.isAllItemSelected ? gettext('Unselect all items') : gettext('Select all items')} />
                 </th>
                 <th width="3%" className="pl10">{/*icon */}</th>
                 <th width="5%" className="pl10">{/*star */}</th>
diff --git a/frontend/src/components/file-uploader/file-uploader.js b/frontend/src/components/file-uploader/file-uploader.js
index 8e520d12ac..a0ea1fbd31 100644
--- a/frontend/src/components/file-uploader/file-uploader.js
+++ b/frontend/src/components/file-uploader/file-uploader.js
@@ -681,7 +681,7 @@ class FileUploader extends React.Component {
       <Fragment>
         <div className="file-uploader-container">
           <div className="file-uploader">
-            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick}/>
+            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick} aria-label={gettext('Upload')} />
           </div>
         </div>
         {this.state.isUploadRemindDialogShow &&
diff --git a/frontend/src/components/shared-link-file-uploader/file-uploader.js b/frontend/src/components/shared-link-file-uploader/file-uploader.js
index 423f1ab2e0..703d33e282 100644
--- a/frontend/src/components/shared-link-file-uploader/file-uploader.js
+++ b/frontend/src/components/shared-link-file-uploader/file-uploader.js
@@ -664,7 +664,7 @@ class FileUploader extends React.Component {
       <Fragment>
         <div className="file-uploader-container">
           <div className="file-uploader">
-            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick}/>
+            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick} aria-label={gettext('Upload')} />
           </div>
         </div>
         {this.state.isUploadProgressDialogShow &&
diff --git a/frontend/src/pages/upload-link/file-uploader.js b/frontend/src/pages/upload-link/file-uploader.js
index dc915f7e81..6f2b63261a 100644
--- a/frontend/src/pages/upload-link/file-uploader.js
+++ b/frontend/src/pages/upload-link/file-uploader.js
@@ -622,7 +622,7 @@ class FileUploader extends React.Component {
       <Fragment>
         <div className="file-uploader-container">
           <div className="file-uploader">
-            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick} />
+            <input className="upload-input" type="file" ref={this.uploadInput} onClick={this.onClick} aria-label={gettext('Upload')} />
           </div>
         </div>
         <UploadProgressDialog
diff --git a/frontend/src/pages/upload-link/upload-progress-dialog.js b/frontend/src/pages/upload-link/upload-progress-dialog.js
index 74cd5bc8a7..94b7665cbe 100644
--- a/frontend/src/pages/upload-link/upload-progress-dialog.js
+++ b/frontend/src/pages/upload-link/upload-progress-dialog.js
@@ -104,10 +104,10 @@ class UploadProgressDialog extends React.Component {
           <table className="table-thead-hidden">
             <thead>
               <tr>
-                <th width="40%">{gettext('name')}</th>
-                <th width="15%">{gettext('size')}</th>
-                <th width="30%">{gettext('progress')}</th>
-                <th width="15%">{gettext('state')}</th>
+                <th width="40%" scope="col">{gettext('name')}</th>
+                <th width="15%" scope="col">{gettext('size')}</th>
+                <th width="30%" scope="col">{gettext('progress')}</th>
+                <th width="15%" scope="col">{gettext('state')}</th>
               </tr>
             </thead>
             <tbody>
diff --git a/seahub/avatar/templatetags/avatar_tags.py b/seahub/avatar/templatetags/avatar_tags.py
index 6915a4aafe..24800c6bb3 100644
--- a/seahub/avatar/templatetags/avatar_tags.py
+++ b/seahub/avatar/templatetags/avatar_tags.py
@@ -95,14 +95,14 @@ def avatar(user, size=AVATAR_DEFAULT_SIZE):
             logger.error(e)
             url = get_default_avatar_non_registered_url()
 
-    return format_html("""<img src="%s" width="%s" height="%s" class="avatar" />""" % (url, size, size))
+    return format_html("""<img src="%s" width="%s" height="%s" class="avatar" alt="Avatar" />""" % (url, size, size))
 
 @cache_result
 @register.simple_tag
 def primary_avatar(user, size=AVATAR_DEFAULT_SIZE):
     """
     This tag tries to get the default avatar for a user without doing any db
-    requests. It achieve this by linking to a special view that will do all the 
+    requests. It achieve this by linking to a special view that will do all the
     work for us. If that special view is then cached by a CDN for instance,
     we will avoid many db calls.
     """
diff --git a/seahub/templates/registration/login.html b/seahub/templates/registration/login.html
index e3221ab999..65b25a6af6 100644
--- a/seahub/templates/registration/login.html
+++ b/seahub/templates/registration/login.html
@@ -197,12 +197,6 @@ $('#login-form').on('submit', function(){
         return false;
     }
 });
-// set tabindex
-$(function() {
-    $('input:not([type="hidden"])').each(function(index) {
-        $(this).attr('tabindex', index + 1);
-    });
-});
 
 {% if enable_sso %}
 $(function() {
diff --git a/seahub/templates/registration/multi_adfs_sso.html b/seahub/templates/registration/multi_adfs_sso.html
index 1cb3244831..6270ca9b30 100644
--- a/seahub/templates/registration/multi_adfs_sso.html
+++ b/seahub/templates/registration/multi_adfs_sso.html
@@ -32,10 +32,10 @@ html, body, #wrapper { height:100%; }
 
 {% block main_content %}
 <div class="login-panel-outer-container vh">
-<div class="login-panel">
+<div class="login-panel" id="log-in-panel">
     <h1 class="login-panel-hd">{% trans "Log In" %}</h1>
     <form action="" method="post" id="login-form">{% csrf_token %}
-        <input type="text" name="login" placeholder="{% trans "Email or Username" %}" aria-label="{% trans "Email or Username" %}" title="{% trans "Email or Username" %}" value="" class="input name-input" /><br />
+        <input type="text" name="login" placeholder="{% trans "Email or Username" %}" aria-label="{% trans "Email or Username" %}" title="{% trans "Email or Username" %}" value="" class="input" /><br />
 
         <input type="hidden" name="next" value="{% if next %}{{ next|escape }}{% else %}{{ SITE_ROOT }}{% endif %}" />
         {% if error_msg %}
@@ -91,12 +91,6 @@ $('#login-form').on('submit', function(){
         return false;
     }
 });
-// set tabindex
-$(function() {
-    $('input:not([type="hidden"])').each(function(index) {
-        $(this).attr('tabindex', index + 1);
-    });
-});
 
 </script>
 {% endblock %}
diff --git a/seahub/templates/sysadmin/sudo_mode.html b/seahub/templates/sysadmin/sudo_mode.html
index 8d6e54db43..67ce729110 100644
--- a/seahub/templates/sysadmin/sudo_mode.html
+++ b/seahub/templates/sysadmin/sudo_mode.html
@@ -72,12 +72,6 @@ $('[type="submit"]').on('click', function(){
         return false;
     }
 });
-// set tabindex
-$(function() {
-    $('input:not([type="hidden"]), button').each(function(index) {
-        $(this).attr('tabindex', index + 1);
-    });
-});
 
 {% if enable_sso %}
 $(function() {