Scroll web page to the sentence shown in search engine results.
Yes, sometimes it does not work, mostly because the text is not visible in page. The snippet shown on search engine results could be taken from meta tag "description", or could be in an element with visibility: hidden or display: none. In these cases my script can't do anything.
Sometimes it does not work... cannot pinpoint to a particular site but sometimes it does not highlight, it just jumps to the snippet and sometimes it neither jumps nor highlights. Has happened several times.