Browser windows can be resized, thereby changing the page size. As with fixed font sizes, fixed page layout can lead to accessbility problems on the web. As with fonts, layout aspects of a page can be designed using percentages to create adaptable pages. Margins can be specified as a percentage of the width of the element which contains them. As browser windows widen and narrow, the layout of an element adapts to maintain the same proportions, and so the whole page layout adapts.
Readers can choose the window size they find appropriate to their needs.
Margins, text indentation and other layout aspects can also be specified in relation to the size of the text they contain, using the em unit for specifying margins, text indentation and other layout aspects. So, when a user adjusts their font size to make a page more legible, the margin increases proportionally, and if they adjust it to make it smaller, the margin adapts again. Colors The web is by and large a more colorful medium than the printed page. Color is cheaper on the web. But color poses difficulties to accessibility as well.