1. You should set the background color of the same colour in any place that may be used.
To prevent the picture from loading, the content of the page will also remain readable.
For example, the text is white, the background is dark, and if the background color is not set, the background image does not load successfully.
and the browser most default background is white, then this is the text content cannot be readable.
2. When CSS styles are disabled, the Web can still render good content pages.
Need to be able to better ensure that the core content of the page and style very good separation. Make the structure code clear and easy to read.
The use of tools such as firebug can be implemented observation, modification and debugging.
3. Using the http://validator.w3.org/HTML code Validator
CSS Code Validator http://jigsaw.w3.org/css-validator/
Web design _7_ page missing picture or CSS is still easy to read