CSS Logical Properties and Values Level 1

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Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology. The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in the normative parts of this document are to be interpreted as described in RFC 2119. However, for readability, these words do not appear in all uppercase letters in this specification.All of the text of this specification is normative except sections explicitly marked as non-normative, examples, and notes. [RFC2119]Examples in this specification are introduced with the words “for example” or are set apart from the normative text with class="example", like this:Informative notes begin with the word “Note” and are set apart from the normative text with class="note", like this:Note, this is an informative note.Advisements are normative sections styled to evoke special attention and are set apart from other normative text with …