Leading is the vertical space in a text block, the distance from one baseline of text to the next. Leading strongly affects the legibility of text blocks: too much leading makes it hard for the eye to locate the start of the next line, whereas too little leading confuses the lines of type, because the ascenders of one line get jumbled with the descenders of the line above. In plain html it is not possible to implement true leading, but css offers leading control (“line-height”). In print the general rule is to set the leading of text blocks at about 2 points above the size of the type: for example, 12-point type with 14 points of leading. On the web we suggest more generous leading to compensate for longer line lengths and the lower resolution of the computer screen. Use relative measures, such as ems or percentages, to set leading relative to text size: