15. How it happens
0.2 + 0.1 = 0.30000000000000004
0.7 + 0.1 = 0.7999999999999999
0.01 + 0.06 = 0.06999999999999999
16. Rounding
1. Round a number up Math.ceil()
1.01 => 2
1. Round a number down Math.floor()
1.99 => 1
1. Rounds to the nearest integer Math.round()
4.4 => 4 4.5 => 5
54. Printing changes from page 2
https://15104268797498972201.googlegroups.com/attach/85b893d02dd79a17/example%20of%20problem.jpg
55. page-break
page-break-after : auto | always | avoid | left | right
page-break-before : auto | always | avoid | left | right
page-break-inside : auto | avoid
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