Using CSS :Before and :After Pseudo-Elements With Inline Css

how to create inline style with :before and :after

You can't. With inline styles you are targeting the element directly. You can't use other selectors there.

What you can do however is define different classes in your stylesheet that define different colours and then add the class to the element.

CSS Pseudo-classes with inline styles

No, this is not possible. In documents that make use of CSS, an inline style attribute can only contain property declarations; the same set of statements that appears in each ruleset in a stylesheet. From the Style Attributes spec:

The value of the style attribute must match the syntax of the contents of a CSS declaration block (excluding the delimiting braces), whose formal grammar is given below in the terms and conventions of the CSS core grammar:

declaration-list
  : S* declaration? [ ';' S* declaration? ]*
  ;

Neither selectors (including pseudo-elements), nor at-rules, nor any other CSS construct are allowed.

Think of inline styles as the styles applied to some anonymous super-specific ID selector: those styles only apply to that one very element with the style attribute. (They take precedence over an ID selector in a stylesheet too, if that element has that ID.) Technically it doesn't work like that; this is just to help you understand why the attribute doesn't support pseudo-class or pseudo-element styles (it has more to do with how pseudo-classes and pseudo-elements provide abstractions of the document tree that can't be expressed in the document language).

Note that inline styles participate in the same cascade as selectors in rule sets, and take highest precedence in the cascade (!important notwithstanding). So they take precedence even over pseudo-class states. Allowing pseudo-classes or any other selectors in inline styles would possibly introduce a new cascade level, and with it a new set of complications.

Note also that very old revisions of the Style Attributes spec did originally propose allowing this, however it was scrapped, presumably for the reason given above, or because implementing it was not a viable option.

CSS pseudo-element in inline attribute style

It’s not possible. The working draft you are referring to is over 12 years old. Click on the link “Latest version” in it, and you’ll find the CSS Style Attributes, a W3C Recommendation (“W3C standard”). It was approved recently. It contains no changes to the style attribute as in HTML specs, and this is indeed the message: the attribute has not been enhanced, and there are no plans to do so.

The conclusions depend on why you would use the construct. Normally, just assign an id attribute to the element and use an id selector in CSS.

Use :after selective for inline style setting

You cannot add pseudo operator inline Style, because Pseudo operators are only workable in CSS classes and Ids

and you are taking about adding pseudo operator with style attribute, which is not possible,
For more information visit this article. this will help you
https://www.w3.org/TR/css-style-attr/

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