Why might the code .body { margin: 10px; } be considered a typo?

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The statement that the code .body { margin: 10px; } might be considered a typo because the period indicates that it is targeting a class selector rather than a tag or element selector is valid. In CSS, when a period is used at the beginning of a selector, it signifies that the styles are being applied to a class. If the intention was to apply styles directly to the body element of the HTML document, the appropriate selector would simply be body without the period.

Using a class selector mistakenly implies that there must be an HTML element with a class attribute set to "body," which may not exist. Therefore, if you intended to style the <body> element itself, writing .body would be a typo in this context.

Understanding the differentiation between element selectors (like body, p, div) and class selectors (defined with a period) is crucial for applying styles correctly in CSS.

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