STOP Declaring IDs!?! JavaScript Global Variables Best Practices

У вашего броузера проблема в совместимости с HTML5

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Did you know that you don’t have to use getElementById() or querySelector() to access a DOM element that has an HTML ID?
HTML element IDs are accessible as global variables on the window object.
So, should we stop using `getElementById()` and `querySelector()`?
NO
Even though this does seem to be a convenient way to write a little less code, it should not be used.
It’s always good practice to declare your variables.
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