CSS cascading not happening

Within the usersettings.css.erb file, line numbers are provided for easier reference.

11    #userSettingMain .form-horizontal .controls {
12    
13      margin-left: 30px;
14    }
15    
16    #user_birthday_3i{
17    
18      margin-left: 0px;
19    }

Upon viewing the page, only the first rule is rendered instead of the last one when inspected.

The HTML contains a form with a .form-horizontal class that includes a select_date tag used to choose the user's birthday. Rails generates an element with the ID #user_birthday_3i representing the day number.

What could be causing this discrepancy?

csstwitter-bootstrapruby-on-rails-3css-cascade

Answer №1

The concept of CSS cascading involves not just the order in which rules are written, but also their specificity. The rule 

#userSettingMain .form-horizontal .controls
is more specific than the #user_birthday_3i rule because it has more selectors, reaching deeper into the object tree and thereby taking precedence.

To ensure that the second rule takes priority over the first, you can add !important to the end of the margin definition:

#user_birthday_3i {
    margin-left: 0px !important;
}

Answer №2

It is recommended to apply the !important rule to make sure that the specified margin takes precedence.

28    #user_name{
29    
30      margin-right: 10px !important;
31    }

Answer №3

The hierarchy of CSS cascading is not based on the order of declaration, but rather on increasing specificity. This means that a rule like 

#userSettingMain .form-horizontal .controls
will take precedence over #user_birthday_3i because it is more specific.

To learn more about how specificity is calculated, you can visit http://www.w3.org/TR/CSS2/cascade.html#specificity.

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