Applescript : Click at position not working
The following works for me in macOS High Sierra 10.13.5 and Google Chrome 67.0.3396.99.

Example AppleScript code:

set NoteforGoogleCHrome to "click me"

tell application "Google Chrome" to activate
delay 0.5
tell application "System Events"
    click (every UI element of toolbar 2 of front window of application process "Chrome" whose help is "Multi-highlight")
    delay 1
    key code 48 -- # Tab Key
    delay 0.2
    keystroke NoteforGoogleCHrome &amp; space
end tell


As you can see in the image below, it highlighted all occurrences of click and me.