Line spacing (leading) is at least space-and-a-half within paragraphs, and paragraph spacing is at least 1.5 times larger than the line spacing.
It is hard to read if there are too many characters on a line, so in case of liquid layout etc, set the maximum width and consider the number of characters.
Do not set up a mechanism that allows you to select the background color and foreground color on the web page, or do not set it to be a harmful when using the OS in the high contrast mode. In principle, if you set the foreground color and the background color to no specification in places like the text box, the problem hardly occurs.
It does not mean only relative specification of character size, but also needs to guarantee that there are no characters that can not be read by enlarging.
|Principle||Perceivable||Information and user interface components must be presentable to users in ways they can perceive.|
|Guideline||Distinguishable||Make it easier for users to see and hear content including separating foreground from background.|
|There is consideration in visual presentation of text blocks.|