<header >
<span id="browser-options-search-field-container"
class="search-field-container">
+ <button id="about-button" class="link-button" hidden
+ i18n-content="aboutButton">
+ </button>
<input id="search-field" type="search"
i18n-values="placeholder:searchPlaceholder;
aria-label:searchPlaceholder" incremental>