Why has this been passed without being checked? This is embarrassing and makes us all look like clowns. This is NOT PWM. Where is the mention of the duty cycle?
What is a 'chanching' angle?
BTW, servos are activated by pulse duration, not PWM or pulse density. They are all linked, but they are not the same. For education purposes it would be advisable that we present things correctly. Not like this.
Please remove this utter rubbish.