Undefined

Null

Error

0, 2, 2

1, 2, 2

1, 1, 3

2, 1, 2

[null, null, null]

[undefined, undefined, undefined]

[empty, empty, empty]

[ ]

1 1 4

2 2 4

1 2 4

2 1 4

<option selected="select">

<option selected>

<option selected="chosen">

<option selected="true">

50%

4

2 mm

xx-large

false

true

undefined

Error

"hello World!"

"h"

"Hello World!"

Error

null

undefined

NaN

Ошибка в коде