All properties associated with getComputedStyle(document.body):
{
    "0": "-webkit-text-fill-color",
    "1": "accent-color",
    "2": "border-collapse",
    "3": "border-spacing",
    "4": "caption-side",
    "5": "clip-rule",
    "6": "color",
    "7": "cursor",
    "8": "direction",
    "9": "fill",
    "10": "fill-opacity",
    "11": "fill-rule",
    "12": "font-family",
    "13": "font-feature-settings",
    "14": "font-language-override",
    "15": "font-size",
    "16": "font-style",
    "17": "font-variant",
    "18": "font-variation-settings",
    "19": "font-weight",
    "20": "font-width",
    "21": "image-rendering",
    "22": "letter-spacing",
    "23": "line-height",
    "24": "list-style-image",
    "25": "list-style-position",
    "26": "list-style-type",
    "27": "math-depth",
    "28": "math-shift",
    "29": "math-style",
    "30": "pointer-events",
    "31": "quotes",
    "32": "stroke",
    "33": "stroke-dashoffset",
    "34": "stroke-linecap",
    "35": "stroke-linejoin",
    "36": "stroke-miterlimit",
    "37": "stroke-opacity",
    "38": "stroke-width",
    "39": "tab-size",
    "40": "text-align",
    "41": "text-anchor",
    "42": "text-decoration-line",
    "43": "text-indent",
    "44": "text-justify",
    "45": "text-shadow",
    "46": "text-transform",
    "47": "visibility",
    "48": "white-space",
    "49": "word-break",
    "50": "word-spacing",
    "51": "word-wrap",
    "52": "writing-mode",
    "53": "align-content",
    "54": "align-items",
    "55": "align-self",
    "56": "animation-delay",
    "57": "animation-direction",
    "58": "animation-duration",
    "59": "animation-fill-mode",
    "60": "animation-iteration-count",
    "61": "animation-name",
    "62": "animation-play-state",
    "63": "animation-timing-function",
    "64": "appearance",
    "65": "aspect-ratio",
    "66": "backdrop-filter",
    "67": "background-attachment",
    "68": "background-clip",
    "69": "background-color",
    "70": "background-image",
    "71": "background-origin",
    "72": "background-position-x",
    "73": "background-position-y",
    "74": "background-repeat",
    "75": "background-size",
    "76": "border-bottom-color",
    "77": "border-bottom-left-radius",
    "78": "border-bottom-right-radius",
    "79": "border-bottom-style",
    "80": "border-bottom-width",
    "81": "border-left-color",
    "82": "border-left-style",
    "83": "border-left-width",
    "84": "border-right-color",
    "85": "border-right-style",
    "86": "border-right-width",
    "87": "border-top-color",
    "88": "border-top-left-radius",
    "89": "border-top-right-radius",
    "90": "border-top-style",
    "91": "border-top-width",
    "92": "bottom",
    "93": "box-shadow",
    "94": "box-sizing",
    "95": "clear",
    "96": "clip",
    "97": "clip-path",
    "98": "column-count",
    "99": "column-gap",
    "100": "column-span",
    "101": "column-width",
    "102": "content",
    "103": "content-visibility",
    "104": "counter-increment",
    "105": "counter-reset",
    "106": "counter-set",
    "107": "cx",
    "108": "cy",
    "109": "display",
    "110": "filter",
    "111": "flex-basis",
    "112": "flex-direction",
    "113": "flex-grow",
    "114": "flex-shrink",
    "115": "flex-wrap",
    "116": "float",
    "117": "grid-auto-columns",
    "118": "grid-auto-flow",
    "119": "grid-auto-rows",
    "120": "grid-column-end",
    "121": "grid-column-start",
    "122": "grid-row-end",
    "123": "grid-row-start",
    "124": "grid-template-areas",
    "125": "grid-template-columns",
    "126": "grid-template-rows",
    "127": "height",
    "128": "inline-size",
    "129": "inset-block-end",
    "130": "inset-block-start",
    "131": "inset-inline-end",
    "132": "inset-inline-start",
    "133": "justify-content",
    "134": "justify-items",
    "135": "justify-self",
    "136": "left",
    "137": "margin-block-end",
    "138": "margin-block-start",
    "139": "margin-bottom",
    "140": "margin-inline-end",
    "141": "margin-inline-start",
    "142": "margin-left",
    "143": "margin-right",
    "144": "margin-top",
    "145": "mask",
    "146": "mask-image",
    "147": "mask-type",
    "148": "max-height",
    "149": "max-inline-size",
    "150": "max-width",
    "151": "min-height",
    "152": "min-inline-size",
    "153": "min-width",
    "154": "object-fit",
    "155": "object-position",
    "156": "opacity",
    "157": "order",
    "158": "outline-color",
    "159": "outline-offset",
    "160": "outline-style",
    "161": "outline-width",
    "162": "overflow-x",
    "163": "overflow-y",
    "164": "padding-block-end",
    "165": "padding-block-start",
    "166": "padding-bottom",
    "167": "padding-inline-end",
    "168": "padding-inline-start",
    "169": "padding-left",
    "170": "padding-right",
    "171": "padding-top",
    "172": "position",
    "173": "r",
    "174": "right",
    "175": "rotate",
    "176": "row-gap",
    "177": "rx",
    "178": "ry",
    "179": "scrollbar-gutter",
    "180": "scrollbar-width",
    "181": "stop-color",
    "182": "stop-opacity",
    "183": "table-layout",
    "184": "text-decoration-color",
    "185": "text-decoration-style",
    "186": "text-decoration-thickness",
    "187": "text-overflow",
    "188": "top",
    "189": "transform",
    "190": "transform-box",
    "191": "transform-origin",
    "192": "transition-delay",
    "193": "transition-duration",
    "194": "transition-property",
    "195": "transition-timing-function",
    "196": "unicode-bidi",
    "197": "user-select",
    "198": "vertical-align",
    "199": "width",
    "200": "x",
    "201": "y",
    "202": "z-index"
}
All properties associated with document.body.style by default:
{}
All properties associated with document.body.style after setting some properties:
{
    "0": "display",
    "1": "background-color",
    "2": "font-size"
}