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JavaScript Can Change HTML Content

One of many JavaScript HTML methods is getElementById().
The example below "finds" an HTML element (with id="demo"), and changes the element content innerHTML to "Hello JavaScript":

JavaScript Can Change HTML Styles CSS

Changing the style of an HTML element, is a variant of changing an HTML attribute:

JavaScript Can Hide HTML Elements

Hiding HTML elements can be done by changing the display style:

JavaScript Can Show HTML Elements

Showing hidden HTML elements can also be done by changing the display style: