<form action="<%= search_root_formulae_path %>" id="search-form">
  <input id="search" name="search" type="text" value="<%= params[:search] || 'search&hellip;'.html_safe %>" />
</form>

<form action="<%= search_root_formulae_path %>" id="search-form">
  <input id="search" name="search" type="text" placeholder="<%= params[:search] || 'search&hellip;'.html_safe %>" />
</form>

Use placeholder instead of value in search input
Use placeholder instead of value in search input