"Yanyan Computer basics Game": HTML5 Crossword

Across

6. A record of web pages that you have visited in the past (7,7)
9. Reads data but only writes once (4,5)
11. Mounted inside system unit, main storage unit (4,4)
13. A device that sends and receives data to and from computer over telephone lines (5)
14. A device that connects at least two networks (7)
15. Optional software additions that enhance and/or add functionality to a web browser. (7)

Down

1. A device that serves as an entrance to another network (7)
2. Reads and write data to optical devices (4,5)
3. Small, re-recordable, used mostly for cameras (6,4)
4. transfer of data from one computer system to another. (9)
5. a program with a Graphical user interference (GUI) for displaying HTML files, used to navigate the World Wide Web (7)
7. A vast computer network linking smaller computer networks World wide (8)
8. Removable and rewritable, uses USB port (3,5)
10. A unique number identifying street address and number assigned to each computer connected to the internet (2,7)
11. the introductory page of a website, typically serving as a table of context for the site (8)
12. Allows multiple documents to be contained within a single window (4)