Search occurrences

When a search result is clicked, an UI element is displayed on the target page to help navigating between occurrences of the text query.

• scrolls to the previous occurrence. If first occurrence is set, goes to the last.
• 1/22 displays the current search occurrence index. If clicked, scrolls to the current search occurrence
• scrolls to the next occurrence. If last occurrence is set, goes to the first.
• stops the search occurrences feature.