Bootstrap 4 forms horizontal legend (Interactive Example)

<!DOCTYPE html>
<title>My Example</title>


<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<style>
body {
padding-top: 1em;
}	
</style> 
<div class="container">
<form action="/html/tags/html_form_tag_action.cfm">

<fieldset class="form-group">
<div class="row">
<legend class="col-form-label col-3">Fruit</legend>
<div class="col-9">
<div class="form-check">
<label class="form-check-label">
<input class="form-check-input" type="radio" name="legendRadio" id="legendRadio1" value="1">
Apple
</label>
</div>
<div class="form-check">
<label class="form-check-label">
<input class="form-check-input" type="radio" name="legendRadio" id="legendRadio2" value="2" checked>
Orange
</label>
</div>
<div class="form-check">
<label class="form-check-label">
<input class="form-check-input" type="radio" name="legendRadio" id="legendRadio3" value="3">
Watermelon
</label>
</div>
</div>
</div>
</fieldset>

<div class="form-group row">
<label for="first_name" class="col-3 col-form-label">First Name</label>
<div class="col-9">
<input type="text" class="form-control" id="first_name" name="first_name">
</div>
</div>
<div class="form-group row">
<label for="last_name" class="col-3 col-form-label">Last Name</label>
<div class="col-9">
<input type="text" class="form-control" id="last_name" name="last_name">
</div>
</div>

<div class="form-group row">
<div class="offset-3 col-9">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</div>

</form>
</div>


<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>


<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>


<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>


<script>
// Initialize tooltip component
$(function () {
  $('[data-toggle="tooltip"]').tooltip()
})

// Initialize popover component
$(function () {
  $('[data-toggle="popover"]').popover()
})
</script>