1) The dom state is that everything inside the HTML element that you were waiting for already exists when the function is executed. 2) When i am writing javasc

1) The dom state is that everything inside the HTML element that you were waiting for already exists when the function is executed. 2) When i am writing javascript is very common for me to use the global object (window) as the context; so in my case is not a good idea to use the HTML element as context by default.