What is the sequence of application?
Following is the order of precedence of how the styles get applied.
- Inline - Placed in the
HTML
element tag itself.
- Internal - Placed in the view page inside a
<style>
tag.
- External - Placed in the external style sheet (.css) file.
That is to say - the styles which reside closest to the HTML tag will take the precedence.
To demonstrate this following is a short illustration:
/* external style sheet */
body
{
background-color: red;
}
<!Document HTML>
<style type="text/css">
/* internal style */
body
{
background-color: green;
}
</style>
<!-- inline style -->
<body style = "background-color: blue">
<h1>Hey there!</h1>
</body>
</HTML>
As you can see, the body has the blue color as per the precedence order, no matter what was defined in an internal/external style.
You can, however, make any style defined at any level to supersede with your style at any place using !important keyword with your styles but it should be used wisely and purposefully.
I am creating HTML elements from javascript and adding styles and classes.
Adding a style via JavaScript gets applied as an inline style on that particular tag. This means if you have written the same style somewhere else then it might not work unless you are using !important
.
However, It is generally not recommended to add the styles through JavaScript
because it decreases the performance of your webpage if you have been using it extensively.
A better approach would be to toggle CSS classes from JavaScript because this way you would not be switching CSS styles explicitly.