As text is very important part of web design, typography (proper use of text font and color attributes) is fundamental to a more impactful web design. Typography covers the text attributes like,
Text color is a important attribute of text, which if used improperly can really effect the readability. Some web designers tend to use low-contrast text which looks good but does not read well. Text color should be selected keeping in mind the readability of text and its impact on overall look and feel of design.
Font type is another important text attribute, which should be selected keeping in mind the message, target audience and overall layout of the website. Selection of wrong font type could really affect the impact of design by decreasing readability.
Just a few years back, web designers tend to use small font size for text, which was not great in terms of text readability. Now with the emergence of Web 2.0, web designers have realized the fact that text is meant to be read and there is no point in adding text which is not readable. Font size should be selected keeping in mind the readability of text.