Previous value: -"The whole board in the Notematics format: # title, :::companion, :::font and :::show lines under it, ## pages, Markdown with $...$ formulas and [words]{red highlight} spans, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood, :::show lines and marks (:::strike \"+3\", :::cancel, :::cross, :::underline, :::double, :::circle, :::box, and :::unmark to rub one out) under ### step headings. The ~~~notematics fence around it is optional."New value: +"The whole board in the Notematics format: # title, :::companion, :::font, :::theme and :::show lines under it, ## pages, Markdown with $...$ formulas and [words]{red highlight} spans, :::graph blocks (curves, points, segment(A, B), line, ray, perp(A, x), on(f, 2), text (x, y) \"words\"), :::geometry and :::solid blocks, and :::comment, :::say blocks and :::mood, :::show lines and marks (:::strike \"+3\", :::cancel, :::cross, :::underline, :::double, :::circle, :::box, and :::unmark to rub one out) under ### step headings. The ~~~notematics fence around it is optional."

Previous value: -"The whole board in the Math Board format: # title, :::companion, :::font and :::show lines under it, ## pages, Markdown with $...$ formulas and [words]{red highlight} spans, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood, :::show lines and marks (:::strike \"+3\", :::cancel, :::cross, :::underline, :::double, :::circle, :::box, and :::unmark to rub one out) under ### step headings. The ~~~mathboard fence around it is optional."New value: +"The whole board in the Notematics format: # title, :::companion, :::font and :::show lines under it, ## pages, Markdown with $...$ formulas and [words]{red highlight} spans, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood, :::show lines and marks (:::strike \"+3\", :::cancel, :::cross, :::underline, :::double, :::circle, :::box, and :::unmark to rub one out) under ### step headings. The ~~~notematics fence around it is optional."

Added value: +{
+  "description": "true: the link opens the board straight in the presentation player, which plays it step by step (for a presentation, an explainer, a video lesson). Leave it out for a board to look at and work on.",
+  "type": "boolean"
+}

Added value: +{
+  "description": "The language of the :::say blocks, to voice them with the site's voice of that language. Leave it out for a board without narration, or to leave the voicing to the teacher.",
+  "enum": [
+    "ru",
+    "uk",
+    "en",
+    "fr",
+    "es",
+    "it"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "How fast the voice speaks: 1 is normal, 0.85 or 0.75 slower (for younger students), 1.1 or 1.25 faster.",
+  "enum": [
+    0.75,
+    0.85,
+    1,
+    1.1,
+    1.25
+  ],
+  "type": "number"
+}

Added value: +{
+  "description": "A voice id from get_voices for that language (a man's or a woman's voice, for example). Leave it out for the site's default voice of the language.",
+  "maxLength": 160,
+  "type": "string"
+}

Previous value: -"The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood lines under ### step headings. The ~~~mathboard fence around it is optional."New value: +"The whole board in the Math Board format: # title, :::companion, :::font and :::show lines under it, ## pages, Markdown with $...$ formulas and [words]{red highlight} spans, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood, :::show lines and marks (:::strike \"+3\", :::cancel, :::cross, :::underline, :::double, :::circle, :::box, and :::unmark to rub one out) under ### step headings. The ~~~mathboard fence around it is optional."

Previous value: -"The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks under ### step headings. The ~~~mathboard fence around it is optional."New value: +"The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood lines under ### step headings. The ~~~mathboard fence around it is optional."

Previous value: -"The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, and :::graph, :::geometry, :::solid blocks. The ~~~mathboard fence around it is optional."New value: +"The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks under ### step headings. The ~~~mathboard fence around it is optional."