diff --git a/src/Element.php b/src/Element.php
index c5da44c..2fa8678 100644
--- a/src/Element.php
+++ b/src/Element.php
@@ -5,7 +5,9 @@
 
 use Stringable;
 
-class Element implements Stringable
+use Eightfold\HtmlBuilder\PropertyInterface;
+
+class Element implements Stringable, PropertyInterface
 {
     /**
      * The following attributes will be placed in this order if used in an
diff --git a/src/Forms/Select.php b/src/Forms/Select.php
index 84be7e5..d9ab4db 100644
--- a/src/Forms/Select.php
+++ b/src/Forms/Select.php
@@ -6,16 +6,28 @@
 use Stringable;
 
 use Eightfold\HtmlBuilder\Element;
+use Eightfold\HtmlBuilder\PropertyInterface;
 
 use Eightfold\HtmlBuilder\Forms\SelectType;
 
 class Select implements Stringable
 {
+    // phpcs:disable
+    private string $warningId {
+        get => $this->name . '-warning';
+    }
+    // phpcs:enable
+
     /**
      * @var string[]
      */
     private array $wrapperProperties = [];
 
+    /**
+     * @var string[]
+     */
+    private array $labelProperties = [];
+
     private SelectType $type = SelectType::Dropdown;
 
     /**
@@ -26,9 +38,10 @@ public static function create(
         string|Stringable $label,
         string|Stringable $name,
         array $options,
-        string|array $selected = []
+        string|array $selected = [],
+        string|PropertyInterface $warningMessage = ''
     ): self {
-        return new self($label, $name, $options, $selected);
+        return new self($label, $name, $options, $selected, $warningMessage);
     }
 
     /**
@@ -39,7 +52,8 @@ final private function __construct(
         private readonly string|Stringable $label,
         private readonly string|Stringable $name,
         private readonly array $options,
-        private string|array $selected = []
+        private readonly string|array $selected = [],
+        private readonly string|PropertyInterface $warningMessage = ''
     ) {
     }
 
@@ -49,6 +63,12 @@ public function wrapperProps(string ...$properties): self
         return $this;
     }
 
+    public function labelProps(string ...$properties): self
+    {
+        $this->labelProperties = $properties;
+        return $this;
+    }
+
     public function dropdown(): self
     {
         $this->type = SelectType::Dropdown;
@@ -69,7 +89,7 @@ public function checkbox(): self
 
     private function hasSelected(): bool
     {
-        $selected = $this->selected();
+        $selected = self::selected();
         if (is_string($selected) and strlen($selected) > 0) {
             return true;
 
@@ -100,22 +120,37 @@ private function selected(): string|array
 
     private function isSelected(string $value): bool
     {
-        if ($this->hasSelected() === false) {
+        if (self::hasSelected() === false) {
             return false;
         }
 
-        if (is_array($this->selected())) {
-            return in_array($value, $this->selected());
+        if (is_array(self::selected())) {
+            return in_array($value, self::selected());
+        }
+        return $value === self::selected();
+    }
+
+    private function warningMessage(): string|PropertyInterface
+    {
+        if ($this->warningMessage === '') {
+            return '';
+        }
+
+        if (is_string($this->warningMessage)) {
+            return Element::p($this->warningMessage)->props(
+                'id ' . $this->warningId
+            );
         }
-        return $value === $this->selected();
+
+        return $this->warningMessage->prop('id ' . $this->warningId);
     }
 
     public function __toString(): string
     {
         if ($this->type === SelectType::Dropdown) {
-            return (string) $this->selectDropdown();
+            return (string) self::selectDropdown();
         }
-        return (string) $this->selectOther();
+        return (string) self::selectOther();
     }
 
     private function selectDropdown(): Element
@@ -124,19 +159,26 @@ private function selectDropdown(): Element
         foreach ($this->options as $value => $content) {
             $value  = (string) $value;
             $option = Element::option($content)->props('value ' . $value);
-            if ($this->isSelected($value)) {
+            if (self::isSelected($value)) {
                 $option = $option->prop('selected selected');
             }
             $elements[] = $option;
         }
 
+        $input = Element::select(
+            ...$elements
+        )->props('id ' . $this->name, 'name ' . $this->name);
+        if (self::warningMessage() !== '') {
+            $input = $input->prop('aria-invalid true');
+            $input = $input->prop('aria-describedby ' . $this->warningId);
+        }
+
         return Element::div(
             Element::label(
                 $this->label
-            )->props('for ' . $this->name),
-            Element::select(
-                ...$elements
-            )->props('id ' . $this->name, 'name ' . $this->name)
+            )->props('for ' . $this->name, ...$this->labelProperties),
+            $input,
+            self::warningMessage()
         )->props(...$this->wrapperProperties);
     }
 
@@ -156,13 +198,19 @@ private function selectOther(): Element
                 'type ' . $type,
                 'value ' . $value
             );
-            if ($this->isSelected($value)) {
+
+            if (self::isSelected($value)) {
                 $input = $input->prop('checked checked');
             }
-            $elements[] = Element::div($input, $label);
+
+            if (self::warningMessage() !== '') {
+                $input = $input->prop('aria-invalid true');
+                $input = $input->prop('aria-describedby ' . $this->warningId);
+            }
+            $elements[] = Element::div($input, $label, self::warningMessage());
         }
         return Element::fieldset(
-            Element::legend($this->label),
+            Element::legend($this->label)->props(...$this->labelProperties),
             ...$elements
         );
     }
diff --git a/src/PropertyInterface.php b/src/PropertyInterface.php
new file mode 100644
index 0000000..1818e83
--- /dev/null
+++ b/src/PropertyInterface.php
@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace Eightfold\HtmlBuilder;
+
+interface PropertyInterface
+{
+    public function props(string ...$properties): static;
+
+    public function prop(string $prop): static;
+}
diff --git a/tests/Forms/SelectTest.php b/tests/Forms/SelectTest.php
index 22920d4..ae24790 100644
--- a/tests/Forms/SelectTest.php
+++ b/tests/Forms/SelectTest.php
@@ -8,8 +8,101 @@
 
 use Eightfold\HtmlBuilder\Forms\Select;
 
+use Eightfold\HtmlBuilder\Element;
+
 class SelectTest extends TestCase
 {
+    #[Test]
+    public function warning_message_can_be_property_interface(): void // phpcs: ignore
+    {
+        $expected = <<<html
+        <div><label for="select">Select</label><select id="select" name="select" aria-describedby="select-warning" aria-invalid="true"><option value="value">display</option><option value="value2">display2</option></select><ul id="select-warning"><li>Invalid value</li></ul></div>
+        html;
+
+        $result = (string) Select::create(
+            label: 'Select',
+            name: 'select',
+            options: [
+                'value'  => 'display',
+                'value2' => 'display2'
+            ],
+            warningMessage: Element::ul(
+                Element::li('Invalid value')
+            )
+        );
+
+        parent::assertSame($expected, $result);
+    }
+
+    #[Test]
+    public function warning_message_can_be_string(): void // phpcs: ignore
+    {
+        $expected = <<<html
+        <div><label for="select">Select</label><select id="select" name="select" aria-describedby="select-warning" aria-invalid="true"><option value="value">display</option><option value="value2">display2</option></select><p id="select-warning">Invalid value</p></div>
+        html;
+
+        $result = (string) Select::create(
+            label: 'Select',
+            name: 'select',
+            options: [
+                'value'  => 'display',
+                'value2' => 'display2'
+            ],
+            warningMessage: 'Invalid value'
+        );
+
+        parent::assertSame($expected, $result);
+    }
+
+    #[Test]
+    public function can_add_props_to_label(): void // phpcs: ignore
+    {
+        $expected = <<<html
+        <div><label is="select-dropdown" for="select">Select</label><select id="select" name="select"><option value="value">display</option><option value="value2">display2</option></select></div>
+        html;
+
+        $result = (string) Select::create(
+            label: 'Select',
+            name: 'select',
+            options: [
+                'value'  => 'display',
+                'value2' => 'display2'
+            ]
+        )->labelProps('is select-dropdown');
+
+        parent::assertSame($expected, $result);
+
+        $expected = <<<html
+        <fieldset><legend is="checkbox">Select</legend><div><input id="select-value" name="select[]" type="checkbox" value="value"><label for="select-value">display</label></div><div><input id="select-value2" name="select[]" type="checkbox" value="value2"><label for="select-value2">display2</label></div></fieldset>
+        html;
+
+        $result = (string) Select::create(
+            label: 'Select',
+            name: 'select',
+            options: [
+                'value'  => 'display',
+                'value2' => 'display2'
+            ]
+        )->checkbox()->labelProps('is checkbox');
+
+        parent::assertSame($expected, $result);
+
+        $expected = <<<html
+        <fieldset><legend is="radio">Select</legend><div><input id="select-value" name="select" type="radio" value="value"><label for="select-value">display</label></div><div><input id="select-value2" name="select" type="radio" value="value2"><label for="select-value2">display2</label></div></fieldset>
+        html;
+
+        $result = (string) Select::create(
+            label: 'Select',
+            name: 'select',
+            options: [
+                'value'  => 'display',
+                'value2' => 'display2'
+            ]
+        )->radio()->labelProps('is radio');
+
+        parent::assertSame($expected, $result);
+    }
+
     #[Test]
     public function can_be_checkboxes(): void // phpcs: ignore
     {
@@ -18,16 +111,16 @@ public function can_be_checkboxes(): void // phpcs: ignore
         html;
 
         $result = (string) Select::create(
-            'Select your option',
-            'select',
-            [
+            label: 'Select your option',
+            name: 'select',
+            options: [
                 'value'  => 'display',
                 'value2' => 'display2'
             ],
-            ['value', 'value2']
+            selected: ['value', 'value2']
         )->checkbox();
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -46,7 +139,7 @@ public function can_be_radio_buttons(): void // phpcs: ignore
             'value'
         )->radio();
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -64,7 +157,7 @@ public function dropdown_mode_is_explicit(): void // phpcs: ignore
             ]
         )->radio()->dropdown();
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -83,7 +176,7 @@ public function checkbox_mode_is_explicit(): void // phpcs: ignore
             'value'
         )->radio()->checkbox();
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -101,7 +194,7 @@ public function can_add_properties_to_wrapper(): void // phpcs: ignore
             ]
         )->wrapperProps('id some-id', 'class some-token');
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -121,7 +214,7 @@ public function can_preselect_option(): void // phpcs:ignore
             'value2'
         );
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -139,7 +232,7 @@ public function is_expected_base(): void // phpcs:ignore
             ]
         );
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 
     #[Test]
@@ -158,6 +251,6 @@ public function error_is_selected_value_always_string(): void // phpcs:ignore
             ]
         );
 
-        $this->assertSame($expected, $result);
+        parent::assertSame($expected, $result);
     }
 }