- HTML - Element reference : https://www.w3schools.com/tags/ref_byfunc.asp
- Html input controls : πατήστε εδώ.
- CSS tutorial & examples : πατήστε εδώ.
- CSS properties and values : πατήστε εδώ.
- JS events list : Πατήστε εδώ.
- JS mouse events list : Πατήστε εδώ.
- JS string methods
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- CSS - Color and Background color Properties
- Pick a color : Πατήστε εδώ (w3schools.com) ή εδώ.
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- Border-Margin-Padding
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- Learn to code : https://www.w3schools.com/
- NTU.edu.sg : html & css straight forward online guide.