HTML5 Synchronize Video Test

The example video is WebM format only, not in all 3 HTML5 formats (MP4, Ogg and WebM,) it needs to be to be viewable in all modern browsers. Firefox, Opera and Chrome play WebM files.

The main video on the left controls (start/stop/reposition) the second right-hand video. The two videos will stay in sync when controlled by the first.

The second video can be played independently of the first. To move the first video to the position of the second, click the "Sync" button.

The first video is made smaller by placing it in a smaller page container using CSS.

Play this 32 sec video using the usual start button, or jump to specific points in the video using these bookmark links:

Click on one of the possible answers to select it, then click the Check button to see if you are right.

Which phrase means "I ate" in French? = * j'ai mangé # * je suis mangé | * j'ai mange | * j'ai manger

`ax^2 + bx + c` has which root? = * `(-b +- sqrt(b^2-4ac))/(2a)` # * `sqrt(b^2-4c)` | * `2b + sqrt(b-4ac)/(2)` | * `(b^2-4ac)/(2)`

Math written first in LateX and then in ASCIIMath notation looks like real math:

When $a \ne 0$, there are two solutions to $ax^2 + bx + c = 0$ and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

The above lines are written in LateX notation, like this:


When \(a \ne 0\), there are two solutions to \(ax^2 + bx + c = 0\) and 
they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

The same math can be written in simpler math text like this, called ASCIIMath:


<p>When `a != 0`, there are two solutions to `ax^2 + bx + c = 0` and they are</p>
<p style="text-align:center">
  `x = (-b +- sqrt(b^2-4ac))/(2a) .`
</p>

Note that the math still looks the same when shown on the page, but you may find either LateX notation or ASCIIMath notation easier to use:

When `a != 0`, there are two solutions to `ax^2 + bx + c = 0` and they are

`x = (-b +- sqrt(b^2-4ac))/(2a) .`