HTML FORM

html_form_action.html

<form action='/submit-cat-photo'>
<input type='text' 
       placeholder='cat photo URL'>
</form>

html_form_button.html

<form action="/submit-cat-photo">
  <input type='text' placeholder='cat photo URL'>
  <button type='submit'>submit</button>
</form>

html_form_chekbox.html

<form action="/submit-cat-photo">
  <label><input type='checkbox' name='personality' checked> Loving</label>
  <label><input type='checkbox' name='personality'> Lazy</label>
  <label><input type='checkbox' name='personality'> Energetic</label>
  <br>  
  <button type='submit'>Submit</button>
</form>

html_form_placeholder.html

<input type='text'
       placeholder='cat photo URL'>

html_form_radiobuttons.html

<form action="/submit-cat-photo">
  <label><input type='radio' name='indoor-outdoor' checked>indoor</label>
  <label><input type='radio' name='indoor-outdoor'>outdoor</label>
  <button type='submit'>Submit</button>
</form>

html_form_required.html

<form action="/submit-cat-photo">
  <input type='text' placeholder='cat photo URL' required>
  <button type='submit'>Submit</button>
</form>

html_form_textfield.html

<form>
  <input type="text">
</form>