Make sure errors is a part of the label. This is a requirement for WCAG2.

Nyholm · nicolas-grekas · commit 58676fcb0cbd · 2017-10-12T18:14:30.000+02:00
We -could- work around this by using something like:

&lt;label for=”name”&gt;Name: &lt;span class=”hidden”&gt;Error message&lt;/span&gt;&lt;/label&gt;
&lt;input id=”name” type=”text”&gt;
&lt;span aria-hidden=”true”&gt;Error message&lt;/span&gt;
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
@@ -28,7 +28,6 @@ col-sm-2
             {{- form_label(form) -}}
             <div class="{{ block('form_group_class') }}">
                 {{- form_widget(form) -}}
-                {{- form_errors(form) -}}
             </div>
     {##}</div>
     {%- endif -%}
@@ -40,7 +39,6 @@ col-sm-2
             {{- form_label(form) -}}
             <div class="{{ block('form_group_class') }}">
                 {{- form_widget(form) -}}
-                {{- form_errors(form) -}}
             </div>
         </div>
 {##}</fieldset>
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
@@ -75,8 +75,27 @@
         {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' col-form-legend')|trim}) -%}
     {%- endif -%}
     {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' form-control-label')|trim}) -%}
-    {{- parent() -}}
-{%- endblock form_label %}
+
+    {% if label is not same as(false) -%}
+        {% if not compound -%}
+            {% set label_attr = label_attr|merge({'for': id}) %}
+        {%- endif -%}
+        {% if required -%}
+            {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' required')|trim}) %}
+        {%- endif -%}
+        {% if label is empty -%}
+            {%- if label_format is not empty -%}
+                {% set label = label_format|replace({
+                '%name%': name,
+                '%id%': id,
+                }) %}
+            {%- else -%}
+                {% set label = name|humanize %}
+            {%- endif -%}
+        {%- endif -%}
+        <{{ element|default('label') }}{% if label_attr %}{% with { attr: label_attr } %}{{ block('attributes') }}{% endwith %}{% endif %}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}{{- form_errors(form) -}}</{{ element|default('label') }}>
+    {%- endif -%}
+{%- endblock form_label -%}
 
 {% block checkbox_radio_label -%}
     {#- Do not display the label if widget is not defined in order to prevent double label rendering -#}
@@ -113,7 +132,6 @@
     <{{ element|default('div') }} class="form-group">
         {{- form_label(form) -}}
         {{- form_widget(form) -}}
-        {{- form_errors(form) -}}
     </{{ element|default('div') }}>
 {%- endblock form_row %}
 
