In a Windows or Android device, press CTRL and F together: on a Mac device press cmd and F together.
A bar opens near the top of the displayed page, with layout depending on your browser:
In Internet Explorer it is:
In the drop down Options select Match whole word only or Match case (if required).
Other browsers are similar
Type a word or contiguous phrase.
All occurrences of the word or phrase will be highlighted in the page below with Previous and Next navigation words or symbols in the search bar.