1.http://www.w3schools.com/css/css_howto.asp
Cascading order
Note: If the link to the external style sheet is placed after the internal style sheet in HTML <head>, the external style sheet will override the internal style sheet!
2.http://www.w3schools.com/css/css_font.asp
Set Font Size With Em
The size can be calculated from pixels to em using this formula: pixels/16=em
Use a Combination of Percent and Em
The solution that works in all browsers, is to set a default font-size in percent for the body element:
Example
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http://www.w3schools.com/css/tryit.asp?filename=trycss_table_border-collapse
4.http://www.w3schools.com/css/css_list.asp
Crossbrowser Solution
The following example displays the image-marker equally in all browsers:
Example
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5.http://www.w3schools.com/css/css_boxmodel.asp
Browsers Compatibility Issue
If you tested the previous example in Internet Explorer, you saw that the total width was not exactly 250px.
IE8 and earlier versions includes padding and border in the width, when the width property is set,unless a DOCTYPE is declared.
To fix this problem, just add a DOCTYPE to the code:
Example
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6.http://www.w3schools.com/js/js_functions.asp
Note: Do not forget about the importance of capitals in JavaScript! The word function must be written in lowercase letters, otherwise a JavaScript error occurs! Also note that you must call a function with the exact same capitals as in the function name.
7.http://www.w3schools.com/js/js_loop_for_in.asp
JavaScript Try...Catch Statement
8.http://www.w3schools.com/js/js_try_catch.asp
JavaScript Try...Catch Statement
Note that try...catch is written in lowercase letters. Using uppercase letters will generate a JavaScript error!
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