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* Summary of substantive changes *
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NOTE 1: This summary is provided for illustration only. For an exhaustive list of changes, please
refer to the changesets at https://github.com/w3c/imsc or use the W3C diff tool at
http://services.w3.org/htmldiff across published versions of the specification.

NOTE 2: Issues and their dispositions are documented at https://github.com/w3c/imsc/issues


From PR (20200616)
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No substantive change made.


From CR (20200324)
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* Update TTML2 ref to point to TTML2 2ED (#531)

* Improve note regarding the use of altText for content authors (#521)

* Add a note that the user can influence the document processing context (#523)

* Clarify WCAG considerations (#519 and #520)


From WD (20191128)	
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* Clarify the disposition of #content in Image Profile (#494)

* Correct the disposition of #bidi (#491)

* Clarify the semantics of partially supported disposition (#488)

* Update security and privacy considerations (#503)

* Correct profile signaling in examples (#505)

* Revert Image Profile designator version to 1.1 (#509)

* Add note on using shear instead of italic or oblique for Japanese text (#495)

* Changed SMPTE-TT reference to 2010 edition (#511)

* Clarify use of validator to warn about overly constrained profiles (#506)

* Permit CSS font matching algorithm (#516)

* Replaced HTML5 reference with WHATWG HTML reference (#525)