JavaScript Taskbook Level 10.9

Write a code that will draw an arrow on the canvas. The arrowhead should point to a given point, and the arrow itself should be tilted at a given angle.

Given a div, the text of which is some CSS code. Write a script that will highlight the syntax of this code.

When entering a page of the site, show the user a countdown that will end in an hour from the moment the user enters the site. Make it so that after refreshing the page, the countdown continues from the place where it stopped.

Write code that will generate a table with randomly placed ships for a game of sea battle.

Given an HTML table, in which there are pluses in two arbitrary cells:

By clicking on the button, fill in all the cells around the given ones with minuses as follows: