1) In-line styles - these are included in the HTML tab as style attributes.
2) Document level styles (textbook: embedded & global) - these are styles listed in the "head" tag and effect the entire document.
3) Linked or external style sheet - these are general style sheets that are usually used for an entire web application. are located in a separate file and inserted into the document using the "link" tag.
Style hierarchy is as follows: in-line take precedent over document level which takes precedent over external which takes precedent over browser.
Know about Class and Id tags:
Class is represented as .classname
Id is represented as #id-name
Class is represented as .classname
Id is represented as #id-name
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