{
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            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": false,
              "impl_url": "https://bugzil.la/1278697"
            },
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            },
            "oculus": "mirror",
            "opera": "mirror",
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            },
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          },
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          "tags": [
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            "webview_ios": "mirror"
          },
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            "standard_track": true,
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          "tags": [
            "web-features:mathml"
          ],
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            },
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            },
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            "opera": "mirror",
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            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
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            "standard_track": true,
            "deprecated": false
          }
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          "spec_url": "https://html.spec.whatwg.org/multipage/dom.html#dom-dataset-dev",
          "tags": [
            "web-features:dataset"
          ],
          "support": {
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            },
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          "tags": [
            "web-features:mathml"
          ],
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          "tags": [
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            "standard_track": true,
            "deprecated": false
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MathMLElement/style",
          "spec_url": "https://drafts.csswg.org/cssom/#dom-elementcssinlinestyle-style",
          "tags": [
            "web-features:mathml"
          ],
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            },
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          },
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            "standard_track": true,
            "deprecated": false
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      "tabIndex": {
        "__compat": {
          "spec_url": "https://html.spec.whatwg.org/multipage/interaction.html#dom-tabindex",
          "tags": [
            "web-features:mathml"
          ],
          "support": {
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            "standard_track": true,
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}