1. Hello, world!
zz( '#t1-1' ).hello();
white. Original value is white, modified must be Hello, world!.
zz( '#t1-2 .selected' ).hello();
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white. Original value is white, modified must be Hello, world!.
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black. Original value is black, must not be modified.
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red. Original value is red, modified must be Hello, world!.
2. isNumeric
zz( '#t2-1' ).isNumeric();
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white. Original value is white, must not me modified.
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7. Original value is 7, must not me modified.
zz( '#t2-2 .t2-2' ).isNumeric(); -> true
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white. Original value is white, must not me modified.
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7. Original value is 7, must not me modified.
zz( '#t2-3 .t2-3' ).isNumeric(); -> false
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white. Original value is white, must not me modified.
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red. Original value is red, must not me modified.
3. velocity with 1 element
3. velocity with several elements