Cascading
Relevant style declarations for a single HTML element can come among others from:
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inline, internal and external CSS,
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inheritance,
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user-agent defaults (aka user-agent style sheets), and
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user overrides.
The process of algorithmic determination of style declarations specifically applicable to a given HTML element, basing on inline, internal, external CSS, inheritance, user-agent defaults and user overrides, is called cascading.
The above-mentioned algorithmic determination process provided the foundation for the Cascading Style Sheets name.