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What is the difference between DOM Level 0 events vs DOM Level 2 events? I ask because I was told that Firefox and IE call them in a different order and I had never heard those terms before.
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The DOM Level 2 Event Model allows a DOM implementation to support multiple sets of events. The model has been designed to allow addition of new event sets as is required. The DOM will not attempt to define all possible events.
The standard DOM Events describes 3 phases of event propagation: Capturing phase – the event goes down to the element. Target phase – the event reached the target element. Bubbling phase – the event bubbles up from the element.
DOM Level 0 events were based around the concept of using element attributes or named events on DOM elements, e.g.:
<input type="button" onclick="clickMe();" />
Or
input.onclick = function() { ... };
With DOM Level 2, we've now got a more standardised approach to managing events and subscriptions, with addEventListener, removeEventListener, etc.
You can read more here here
It wasn't until IE8 that Microsoft added support for the W3C standard for event management to their browser. Not sure in what order they are called....
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