govuk-frontend/dist/govuk/components/password-input/template-default.html

GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

<div class="govuk-form-group govuk-password-input" data-module="govuk-password-input">
  <label class="govuk-label" for="password">
    Password
  </label>
  <div class="govuk-input__wrapper govuk-password-input__wrapper">
    <input class="govuk-input govuk-password-input__input govuk-js-password-input-input" id="password" name="password" type="password" spellcheck="false" autocomplete="current-password" autocapitalize="none">
    <button type="button" class="govuk-button govuk-button--secondary govuk-password-input__toggle govuk-js-password-input-toggle" data-module="govuk-button" aria-controls="password" aria-label="Show password" hidden>
      Show
    </button>
  </div>
</div>