{{ govuk.phaseBanner(
    phase = "alpha",
    message = "This is a new service – your feedback will help us to improve it."
) }}
<%= govuk.phase_banner(
    phase: "alpha",
    message: "This is a new service – your feedback will help us to improve it."
) %> 
<div class="gv-c-phase-banner">
    <p class="gv-c-phase-banner__content">
        <strong class="gv-c-phase-tag">alpha</strong>
        <span class="gv-c-phase-banner__text">This is a new service – your feedback will help us to improve it.</span>
    </p>
</div>
{
  "phase": "alpha",
  "message": "This is a new service – your feedback will help us to improve it."
}