High school diploma seal of biliteracy; designation as high-demand industry workforce credential for certain purposes. Requires the Board of Education to include on its list of industry workforce credentials its diploma seal of biliteracy and to consider such seal to be a high-demand industry workforce credential for the purpose of satisfying graduation requirements and determining and calculating high school student readiness in its school accountability system. An Act to amend and reenact §§ 22.1-253.13:1 and 22.1-253.13:4 of the Code of Virginia, relating to high school diploma seal of biliteracy; designation as high-demand industry workforce credential for certain purposes.