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Id Classes Attributes tags

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If we need to select the element inside the html we have to decide if we want to select one element or multiple elements.
In the first case id is perfect, we can't name two elements with the same id ( the id is unique ).
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To select more than one element we may use classes or attribute.
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In general we use classes to select multiple elements and attribute to filter through them.
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It`s a good practice to use js prefix for the elements that require javaScript to work.
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