diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_horizontal_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_horizontal_layout.html.twig
index b082d9236b927..4dc3e9c896fb7 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_horizontal_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_horizontal_layout.html.twig
@@ -27,7 +27,7 @@ col-sm-2
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <div class="form-group{% if (not compound or force_error|default(false)) and not valid %} has-error{% endif %}">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group' ~ ((not compound or force_error|default(false)) and not valid ? ' has-error'))|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_label(form) -}}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form, widget_attr) -}}
@@ -38,7 +38,7 @@ col-sm-2
 {%- endblock form_row %}
 
 {% block submit_row -%}
-    <div class="form-group">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
@@ -47,7 +47,7 @@ col-sm-2
 {%- endblock submit_row %}
 
 {% block reset_row -%}
-    <div class="form-group">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
@@ -60,7 +60,7 @@ col-sm-10
 {%- endblock form_group_class %}
 
 {% block checkbox_row -%}
-    <div class="form-group{% if not valid %} has-error{% endif %}">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group' ~ (not valid ? ' has-error'))|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_layout.html.twig
index 7d70044e6c8b8..f0cf0ad81854d 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_layout.html.twig
@@ -111,7 +111,7 @@
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <div class="form-group{% if (not compound or force_error|default(false)) and not valid %} has-error{% endif %}">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group' ~ ((not compound or force_error|default(false)) and not valid ? ' has-error'))|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_label(form) }} {# -#}
         {{ form_widget(form, widget_attr) }} {# -#}
         {{- form_help(form) -}}
@@ -120,7 +120,7 @@
 {%- endblock form_row %}
 
 {% block button_row -%}
-    <div class="form-group">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_widget(form) -}}
     </div>
 {%- endblock button_row %}
@@ -146,14 +146,14 @@
 {%- endblock datetime_row %}
 
 {% block checkbox_row -%}
-    <div class="form-group{% if not valid %} has-error{% endif %}">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group' ~ (not valid ? ' has-error'))|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_widget(form) -}}
         {{- form_errors(form) -}}
     </div>
 {%- endblock checkbox_row %}
 
 {% block radio_row -%}
-    <div class="form-group{% if not valid %} has-error{% endif %}">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group' ~ (not valid ? ' has-error'))|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_widget(form) -}}
         {{- form_errors(form) -}}
     </div>
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_horizontal_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_horizontal_layout.html.twig
index e37de07d6b071..a75e364187743 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_horizontal_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_horizontal_layout.html.twig
@@ -28,7 +28,7 @@ col-sm-2
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-        <div class="form-group row{% if (not compound or force_error|default(false)) and not valid %} is-invalid{% endif %}">
+        <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group row' ~ ((not compound or force_error|default(false)) and not valid ? ' is-invalid'))|trim})} %}{{ block('attributes') }}{% endwith %}>
             {{- form_label(form) -}}
             <div class="{{ block('form_group_class') }}">
                 {{- form_widget(form, widget_attr) -}}
@@ -43,7 +43,7 @@ col-sm-2
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <fieldset class="form-group">
+    <fieldset{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <div class="row{% if (not compound or force_error|default(false)) and not valid %} is-invalid{% endif %}">
             {{- form_label(form) -}}
             <div class="{{ block('form_group_class') }}">
@@ -55,7 +55,7 @@ col-sm-2
 {%- endblock fieldset_form_row %}
 
 {% block submit_row -%}
-    <div class="form-group row">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group row')|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
@@ -64,7 +64,7 @@ col-sm-2
 {%- endblock submit_row %}
 
 {% block reset_row -%}
-    <div class="form-group row">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group row')|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
@@ -77,7 +77,7 @@ col-sm-10
 {%- endblock form_group_class %}
 
 {% block checkbox_row -%}
-    <div class="form-group row">{#--#}
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group row')|trim})} %}{{ block('attributes') }}{% endwith %}>{#--#}
         <div class="{{ block('form_label_class') }}"></div>{#--#}
         <div class="{{ block('form_group_class') }}">
             {{- form_widget(form) -}}
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
index 97710c79b59c6..2e6dc23d4fbcd 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
@@ -282,7 +282,7 @@
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <{{ element|default('div') }} class="form-group">
+    <{{ element|default('div') }}{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_label(form) -}}
         {{- form_widget(form, widget_attr) -}}
         {{- form_help(form) -}}
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_base_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_base_layout.html.twig
index a6ee019a094b6..46069980bd8df 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_base_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_base_layout.html.twig
@@ -187,7 +187,7 @@
 {# Rows #}
 
 {% block button_row -%}
-    <div class="form-group">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group')|trim})} %}{{ block('attributes') }}{% endwith %}>
         {{- form_widget(form) -}}
     </div>
 {%- endblock button_row %}
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
index 0a5cd42cfda41..e1a418e84b722 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
@@ -325,7 +325,7 @@
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <div {% with {attr: row_attr|default({})} %}{{ block('attributes') }}{% endwith %}>
+    <div{% with {attr: row_attr} %}{{ block('attributes') }}{% endwith %}>
         {{- form_label(form) -}}
         {{- form_errors(form) -}}
         {{- form_widget(form, widget_attr) -}}
@@ -334,7 +334,7 @@
 {%- endblock form_row -%}
 
 {%- block button_row -%}
-    <div {% with {attr: row_attr|default({})} %}{{ block('attributes') }}{% endwith %}>
+    <div{% with {attr: row_attr} %}{{ block('attributes') }}{% endwith %}>
         {{- form_widget(form) -}}
     </div>
 {%- endblock button_row -%}
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/form_table_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/form_table_layout.html.twig
index 10eaf566d097d..255d6b42bf7bd 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/form_table_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/form_table_layout.html.twig
@@ -5,7 +5,7 @@
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <tr>
+    <tr{% with {attr: row_attr} %}{{ block('attributes') }}{% endwith %}>
         <td>
             {{- form_label(form) -}}
         </td>
@@ -18,7 +18,7 @@
 {%- endblock form_row -%}
 
 {%- block button_row -%}
-    <tr>
+    <tr{% with {attr: row_attr} %}{{ block('attributes') }}{% endwith %}>
         <td></td>
         <td>
             {{- form_widget(form) -}}
@@ -27,7 +27,8 @@
 {%- endblock button_row -%}
 
 {%- block hidden_row -%}
-    <tr style="display: none">
+    {%- set style = row_attr.style is defined ? (row_attr.style ~ (row_attr.style|trim|last != ';' ? '; ')) : '' -%}
+    <tr{% with {attr: row_attr|merge({style: (style ~ ' display: none')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <td colspan="2">
             {{- form_widget(form) -}}
         </td>
diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig
index d8bb8308a36aa..83c5e30d803bc 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig
@@ -277,7 +277,7 @@
     {%- if help is not empty -%}
         {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
     {%- endif -%}
-    <div class="row">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' row')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <div class="large-12 columns{% if (not compound or force_error|default(false)) and not valid %} error{% endif %}">
             {{- form_label(form) -}}
             {{- form_widget(form, widget_attr) -}}
@@ -308,7 +308,7 @@
 {%- endblock datetime_row %}
 
 {% block checkbox_row -%}
-    <div class="row">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' row')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <div class="large-12 columns{% if not valid %} error{% endif %}">
             {{ form_widget(form) }}
             {{ form_errors(form) }}
@@ -317,7 +317,7 @@
 {%- endblock checkbox_row %}
 
 {% block radio_row -%}
-    <div class="row">
+    <div{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' row')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <div class="large-12 columns{% if not valid %} error{% endif %}">
             {{ form_widget(form) }}
             {{ form_errors(form) }}
diff --git a/src/Symfony/Bridge/Twig/composer.json b/src/Symfony/Bridge/Twig/composer.json
index cb2d81e08b3d2..7a635f9330e1e 100644
--- a/src/Symfony/Bridge/Twig/composer.json
+++ b/src/Symfony/Bridge/Twig/composer.json
@@ -26,7 +26,7 @@
         "symfony/asset": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/finder": "~3.4|~4.0",
-        "symfony/form": "^4.3.4",
+        "symfony/form": "^4.3.5",
         "symfony/http-foundation": "~4.3",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/mime": "~4.3",
@@ -48,7 +48,7 @@
     },
     "conflict": {
         "symfony/console": "<3.4",
-        "symfony/form": "<4.3.4",
+        "symfony/form": "<4.3.5",
         "symfony/http-foundation": "<4.3",
         "symfony/translation": "<4.2",
         "symfony/workflow": "<4.3"
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 23fd9efe9990f..b554b2be63eab 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -38,7 +38,7 @@
         "symfony/css-selector": "~3.4|~4.0",
         "symfony/dom-crawler": "^4.3",
         "symfony/polyfill-intl-icu": "~1.0",
-        "symfony/form": "^4.3.4",
+        "symfony/form": "^4.3.5",
         "symfony/expression-language": "~3.4|~4.0",
         "symfony/http-client": "^4.3",
         "symfony/mailer": "^4.3",
@@ -72,7 +72,7 @@
         "symfony/console": "<4.3",
         "symfony/dotenv": "<4.2",
         "symfony/dom-crawler": "<4.3",
-        "symfony/form": "<4.3",
+        "symfony/form": "<4.3.5",
         "symfony/messenger": "<4.3.6",
         "symfony/property-info": "<3.4",
         "symfony/serializer": "<4.2",