govuk-frontend/dist/govuk/components/character-count/template-with-default-value.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-character-count" data-module="govuk-character-count" data-maxlength="100">
  <label class="govuk-label" for="with-default-value">
    Full address
  </label>
  <textarea class="govuk-textarea govuk-js-character-count" id="with-default-value" name="default-value" rows="5" aria-describedby="with-default-value-info">221B Baker Street
London
NW1 6XE
</textarea>
  <div id="with-default-value-info" class="govuk-hint govuk-character-count__message">
    You can enter up to 100 characters
  </div>
</div>