diff --git a/app/soapbox/components/ui/hstack/hstack.tsx b/app/soapbox/components/ui/hstack/hstack.tsx
index a109da608..996320dea 100644
--- a/app/soapbox/components/ui/hstack/hstack.tsx
+++ b/app/soapbox/components/ui/hstack/hstack.tsx
@@ -40,6 +40,8 @@ interface IHStack {
   space?: keyof typeof spaces
   /** Whether to let the flexbox grow. */
   grow?: boolean
+  /** HTML element to use for container. */
+  element?: keyof JSX.IntrinsicElements,
   /** Extra CSS styles for the <div> */
   style?: React.CSSProperties
   /** Whether to let the flexbox wrap onto multiple lines. */
@@ -48,10 +50,12 @@ interface IHStack {
 
 /** Horizontal row of child elements. */
 const HStack = forwardRef<HTMLDivElement, IHStack>((props, ref) => {
-  const { space, alignItems, grow, justifyContent, wrap, className, ...filteredProps } = props;
+  const { space, alignItems, justifyContent, className, grow, element = 'div', wrap, ...filteredProps } = props;
+
+  const Elem = element as 'div';
 
   return (
-    <div
+    <Elem
       {...filteredProps}
       ref={ref}
       className={classNames('flex', {
diff --git a/app/soapbox/components/ui/stack/stack.tsx b/app/soapbox/components/ui/stack/stack.tsx
index 660f46e36..08d412d80 100644
--- a/app/soapbox/components/ui/stack/stack.tsx
+++ b/app/soapbox/components/ui/stack/stack.tsx
@@ -23,24 +23,28 @@ const alignItemsOptions = {
 };
 
 interface IStack extends React.HTMLAttributes<HTMLDivElement> {
-  /** Size of the gap between elements. */
-  space?: keyof typeof spaces
   /** Horizontal alignment of children. */
   alignItems?: 'center'
+  /** Extra class names on the element. */
+  className?: string
   /** Vertical alignment of children. */
   justifyContent?: keyof typeof justifyContentOptions
-  /** Extra class names on the <div> element. */
-  className?: string
+  /** Size of the gap between elements. */
+  space?: keyof typeof spaces
   /** Whether to let the flexbox grow. */
   grow?: boolean
+  /** HTML element to use for container. */
+  element?: keyof JSX.IntrinsicElements,
 }
 
 /** Vertical stack of child elements. */
 const Stack = React.forwardRef<HTMLDivElement, IStack>((props, ref: React.LegacyRef<HTMLDivElement> | undefined) => {
-  const { space, alignItems, justifyContent, className, grow, ...filteredProps } = props;
+  const { space, alignItems, justifyContent, className, grow, element = 'div', ...filteredProps } = props;
+
+  const Elem = element as 'div';
 
   return (
-    <div
+    <Elem
       {...filteredProps}
       ref={ref}
       className={classNames('flex flex-col', {
diff --git a/app/soapbox/features/compose/components/compose-form.tsx b/app/soapbox/features/compose/components/compose-form.tsx
index f9eb98204..e93215aec 100644
--- a/app/soapbox/features/compose/components/compose-form.tsx
+++ b/app/soapbox/features/compose/components/compose-form.tsx
@@ -132,7 +132,7 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
     setComposeFocused(true);
   };
 
-  const handleSubmit = () => {
+  const handleSubmit = (e?: React.FormEvent<Element>) => {
     if (text !== autosuggestTextareaRef.current?.textarea?.value) {
       // Something changed the text inside the textarea (e.g. browser extensions like Grammarly)
       // Update the state to match the current text
@@ -142,6 +142,10 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
     // Submit disabled:
     const fulltext = [spoilerText, countableText(text)].join('');
 
+    if (e) {
+      e.preventDefault();
+    }
+
     if (isSubmitting || isUploading || isChangingUpload || length(fulltext) > maxTootChars || (fulltext.length !== 0 && fulltext.trim().length === 0 && !anyMedia)) {
       return;
     }
@@ -261,7 +265,7 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
   }
 
   return (
-    <Stack className='w-full' space={4} ref={formRef} onClick={handleClick}>
+    <Stack className='w-full' space={4} ref={formRef} onClick={handleClick} element='form' onSubmit={handleSubmit}>
       {scheduledStatusCount > 0 && (
         <Warning
           message={(
@@ -339,7 +343,7 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
             </div>
           )}
 
-          <Button theme='primary' text={publishText} onClick={handleSubmit} disabled={disabledButton} />
+          <Button type='submit' theme='primary' text={publishText} disabled={disabledButton} />
         </div>
       </div>
     </Stack>
diff --git a/app/soapbox/features/compose/components/polls/poll-form.tsx b/app/soapbox/features/compose/components/polls/poll-form.tsx
index 4daf54048..e61f1975f 100644
--- a/app/soapbox/features/compose/components/polls/poll-form.tsx
+++ b/app/soapbox/features/compose/components/polls/poll-form.tsx
@@ -168,7 +168,7 @@ const PollForm: React.FC<IPollForm> = ({ composeId }) => {
 
       <Divider />
 
-      <button onClick={handleToggleMultiple} className='text-left'>
+      <button type='button' onClick={handleToggleMultiple} className='text-left'>
         <HStack alignItems='center' justifyContent='between'>
           <Stack>
             <Text weight='medium'>
@@ -197,7 +197,7 @@ const PollForm: React.FC<IPollForm> = ({ composeId }) => {
 
       {/* Remove Poll */}
       <div className='text-center'>
-        <button className='text-danger-500' onClick={onRemovePoll}>
+        <button type='button' className='text-danger-500' onClick={onRemovePoll}>
           {intl.formatMessage(messages.removePoll)}
         </button>
       </div>
diff --git a/app/soapbox/features/compose/components/spoiler-input.tsx b/app/soapbox/features/compose/components/spoiler-input.tsx
index e6f53d04c..873450116 100644
--- a/app/soapbox/features/compose/components/spoiler-input.tsx
+++ b/app/soapbox/features/compose/components/spoiler-input.tsx
@@ -68,7 +68,7 @@ const SpoilerInput = React.forwardRef<AutosuggestInput, ISpoilerInput>(({
         />
 
         <div className='text-center'>
-          <button className='text-danger-500' onClick={handleRemove}>
+          <button type='button' className='text-danger-500' onClick={handleRemove}>
             {intl.formatMessage(messages.remove)}
           </button>
         </div>
@@ -77,4 +77,4 @@ const SpoilerInput = React.forwardRef<AutosuggestInput, ISpoilerInput>(({
   );
 });
 
-export default SpoilerInput;
\ No newline at end of file
+export default SpoilerInput;