Dimension Preset

{
  "type": "string",
  "enum": [
    "16:9",
    "4:3",
    "16:10",
    "1:1",
    "4:5",
    "9:16",
    "letter",
    "a4",
    "widescreen",
    "standard"
  ],
  "description": "Named preset; sets aspect ratio and physical size. 16:9 ('widescreen'): 13.333 x 7.5 in, PowerPoint's Widescreen. 4:3 ('standard'): 10 x 7.5 in. 16:10: 10 x 6.25 in. letter (11 x 8.5 in) and a4 (11.69 x 8.27 in) are paper sizes, not PowerPoint's Letter Paper or A4 Paper. 1:1, 4:5 and 9:16 are 7.5 in on the short edge."
}