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Html Codes: MathML- Phantom and Invisible Expressions and Boxes

Sometimes it is necessary to leave a space empty in the mathematical expressions. HTML5 MathML Phantom is the tag that does it for you. Everything go inside it will be disappeared and just the occupied space with nothing inside it is appeared. It is also possible to put the space within a box and make it colorful. If it is needed to make a controlled indentation, HTML5 Phantom tag is a suitable solution. In the following example it is tried to show invisible expressions and boxes in some common mathematical styles.

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