Google Chrome: Scroll To Text Fragment
If you are still wondering why some text is being highlighted in yellow when you open a link from Google Search well that's because the new Google Chrome feature called Scroll To Text Fragment.
This feature allows a user or author to link to a specific portion of a page, using a text snippet provided in the URL. When the page is loaded, the browser highlights the text and scrolls it into view.
Unfortunately this isn't very widely supported yet but we hope this could be included in other browsers.