How to add subtitles to a video in html?

Question

I tried using the track element, but it didn't work..could you please tell me if there's something I am doing wrong?

<video controls="controls" id="video1" width="450">
    <source src="A taste of TED.mp4" type="video/mp4">
    <track src="TED.vtt" kind="subtitles" srclang="en" label="English">
 </video>

The subtitle file (TED.vtt) looks like this:

WEBVTT

1
00:00:01.000 --> 00:00:10.000
This is the first line of text, displaying from 1-10 seconds

2
00:00:15.000 --> 00:00:20.000
And the second line of text
separated over two lines