CSS-Syntax

A CSS comprises of style rules that are interpreted by the browser and then applied to the corresponding elements in your document. A style rule is made of three parts ?

  • Selector :-A selector is an HTML tag at which a style will be applied. This could be any tag like <h1> or <table> etc.
  • Property :-A property is a type of attribute of HTML tag. Put simply, all the HTML attributes are converted into CSS properties. They could be color, border etc.
  • Value :- Values are assigned to properties. For example, color property can have value either red or #F1F1F1 etc.
  • The Type Selectors

    This is the same selector we have seen above. Again, one more example to give a color to all level 1 headings:

    Example :-

    The Universal Selectors

    Rather than selecting elements of a specific type, the universal selector quite simply matches the name of any element type ?

    Example :-

    The Descendant Selectors

    Suppose you want to apply a style rule to a particular element only when it lies inside a particular element. As given in the following example, style rule will apply to <em> element only when it lies inside <ul> tag.

    The Class Selectors

    You can define style rules based on the class attribute of the elements. All the elements having that class will be formatted according to the defined rule.

    This rule renders the content in black for every element with class attribute set to black in our document. You can make it a bit more particular. For example:

    The ID Selectors

    You can define style rules based on the id attribute of the elements. All the elements having that id will be formatted according to the defined rule.

    This rule renders the content in black for every element with id attribute set to black in our document. You can make it a bit more particular. For example ?

    The Child Selectors

    You have seen the descendant selectors. There is one more type of selector, which is very similar to descendants but have different functionality. Consider the following example ?

    This rule will render all the paragraphs in black if they are direct child of <body> element. Other paragraphs put inside other elements like <div> or <td> would not have any effect of this rule.

    Multiple Style Rules

    You may need to define multiple style rules for a single element. You can define these rules to combine multiple properties and corresponding values into a single block as defined in the following example ?

    Here all the property and value pairs are separated by a semi colon (;). You can keep them in a single line or multiple lines. For better readability we keep them into separate lines.