Appendix JS_C_A8

Requirement: Timed activity can be controlled.

Details: Use scripting to create a blinking animation that stops in 5 seconds.

<p id="demo"><strong>You have 3 new messages!</strong></p>

var text = document.getElementById('demo')
           .getElementsByTagName('strong').item(0);
 
var interval = 0.5;
var flashes = 0;
 
var timer = window.setInterval(function()
{
    if(text.style.visibility == 'hidden')
    {
        text.style.visibility = 'visible';
    }
    else
    {
        text.style.visibility = 'hidden';
    }
 
    flashes ++;
    if(flashes * interval == 5)
    {
        window.clearInterval(timer);
    }
}, (interval * 1000));