With even a moderately complicated stylesheet, it seems that two or more rules will not work on Internet Information service ( IIS ) platform. CSS handles such conflicts through a process known as the cascade.
The cascade works by assigning an importance to each rule. Author stylesheets are considered the most important, followed by user stylesheets, and finally the default stylesheets used by your browser or user agent when he gives you free css site templates.
To calculate how specific a rule is on IIS windows platform, each type of selector is assigned a numeric value. The specificity of a rule is then calculated by adding up the value of each of its selectors. Unfortunately, specificity is not calculated in base 10 but a high, unspecified, base number. This is to ensure that a highly specific selector, such as an ID selector, is never overridden by lots of less specific selectors, such as class visibility hidden. However, if you have fewer than 10 css templates in a specific selector, you can calculate specificity in base 10 for simplicity’s sake.
- Using these rules it is possible to calculate the specificity of any CSS selector.
At first glance, all this talk of specificity and high but undefined based numbers may seem a little confusing, so here’s what you need to know. Essentially, a rule written in a style attribute will always be more specific than any other rule. A rule with an ID will be more specific than one without an ID, and a rule with a class selector will be more specific than a rule with just type selectors. Finally, if two rules have the same specificity, the last one defined prevails on the css files not working on IIS.
- Using specificity in your stylesheets
Specificity is very useful when writing CSS as it allows you to set general styles for common elements and then override them for more specific elements.
Whenever you want to create a new form you do not have to worry about changing anything in the CSS, as you know it will be styled correctly. However, on larger free css templates sites you will find more and more exceptions will start to creep in. Maybe you will have a login form that you want to be 20em wide or a larger application form that needs to be 40em wide. Each time you create a more specific style, you will probably need to override some of the general rules.
This can lead to quite a bit of extra code.
It can also start to get very complicated as one element may be picking up styles from a variety of places.
To avoid too much confusion, I try to make sure my general styles are very general while my specific styles are as specific as possible and never need to be overridden. If I find that I have to override general styles several times, it’s simpler to remove the declaration that needs to be overridden from the more general rules and apply it explicitly to each element that needs it on your css template files.
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