Write a JavaScript+HTML program that determines whether a triangle is scalene, isosceles, or equilateral triangle.
The sides (A, B, C) of the triangle are input through a form and processed in the same file.
A scalene triangle has three sides with unequal lengths. An isosceles triangle has any of the two equal sides. An equilateral triangle has all sides equal.
A triangle is an invalid if
a. The sum of the lengths of any two sides is not greater than third side. b. The length of any side is 0 or negative.
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