Answer:
Style sheet.
Explanation:
A website is a collection of web pages. Web development tools are mainly HTML,CSS and JavaScript. They have their individual functions in structuring a web page.
JavaScript is a purpose object oriented programming language widely used in web page for writing scripts, aimed to make web pages interactive.
HTML is a mark-up language which provides a non-linear structuring approach to web page development.
CSS or cascaded style sheet is a tool used to design the element and layout of web pages on a device screen.
