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Step 1: A request is made from a Web Browser Window

Step 2: Requested H T M L contains reference forward slash request for separate JavaScript file from the Server to Web Browser

Step 3: Request for JavaScript file from Web Browser to Server

Step 4: Requested JavaScript file returned from Server to Web Browser

Step 5: JavaScript is parsed and then executed by the Web Browser

Step 6: Web Browser displays page based on JavaScript's runtime alteration of the HTML document

There is a code block below Step 4 when Requested JavaScript file returned from Server to Web Browser

Line 1 at indentation level 0: function init open bracket close bracket open curly braces.

Line 2 at indentation level 1: let box equals document dot querySelector open bracket open double quotes hash i d close double quotes close bracket semi colon.

Line 3 at indentation level 1: box dot addEventListener open bracket open double quotes mouseover close double quotes comma.

Line 4 at indentation level 2: function open bracket e close bracket open curly braces.

Line 5 at indentation level 2: dot dot dot.

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