How does IE6 make PNG pictures transparent?

Some people often ask me how to make PNG pictures transparent under IE6. In fact, IE6 browser can't display transparent PNG pictures, which also makes many web designers have headaches, some good effects. Because the page cannot display PNG images transparently, it has to be made into JPG. There are also many ways to solve this problem, but now you only need to use a JS file called "UnitPNGFix" to get it completely. The JS download address: http://labs.unitinteractive.com/unitpngfix.PHP UnitPNGFix is ​​really outstanding. 1. Very small Javascript file: 1kb! 2. Solve the impact of IE's filter properties 3. Whether it is img element or background-image attribute, it can have effect. 4. It can run automatically before loading the page. Or just a little bit of element. 5. Allow automatic height and width. 6. Super easy to use.