Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 101 insertions, 0 deletions

diff --git a/devtools/shared/compatibility/README.md b/devtools/shared/compatibility/README.md
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+# Compatibility Dataset
+
+## How to update the MDN compatibility data
+
+The Compatibility panel detects issues by comparing against official [MDN compatibility data](https://github.com/mdn/browser-compat-data). It uses a local snapshot of the dataset. This dataset needs to be manually synchronized periodically to `devtools/shared/compatibility/dataset` (ideally with every Firefox release).
+
+The subsets from the dataset required by the Compatibility panel are:
+
+- browsers: [https://github.com/mdn/browser-compat-data/tree/master/browsers](https://github.com/mdn/browser-compat-data/tree/master/browsers)
+- css.properties: [https://github.com/mdn/browser-compat-data/tree/master/css](https://github.com/mdn/browser-compat-data/tree/master/css).
+
+In order to download up-to-date data, you need to run the following commands:
+
+- `cd devtools/shared/compatibility`
+- `yarn install --no-lockfile` and select the latest package version for the `@mdn/browser-compat-data` package
+- `yarn update`
+
+This should save the `css-properties.json` JSON file directly in `devtools/shared/compatibility/dataset/`.
+
+The browsers data are stored in a RemoteSettings collection, and updates are handled by a script in https://github.com/firefox-devtools/remote-settings-mdn-browser-compat-data .
+The script is run every day in automation, and if the data are updated, the team should receive a data review email.
+
+To review the data update, you need to be connected to the Mozilla Corporate VPN (See https://mana.mozilla.org/wiki/display/SD/VPN), log into https://settings-writer.stage.mozaws.net/v1/admin/#/buckets/main/collections/devtools-compatibility-browsers/records (Using `OpenID Connect (LDAP)`)
+Then run Firefox, and use the [RemoteSettings DevTools WebExtension](https://github.com/mozilla-extensions/remote-settings-devtools) to use the `Prod (preview)` environment and restart the browser.
+Then open the compatibility panel and make sure that the updated browsers do appear in the `Settings` panel.
+
+Check that all tests still pass. It is possible that changes in the structure or contents of the latest dataset will cause tests to fail. If that is the case, fix the tests. **Do not manually change the contents or structure of the local dataset** because any changes will be overwritten by the next update from the official dataset.
diff --git a/devtools/shared/compatibility/bin/update.js b/devtools/shared/compatibility/bin/update.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// The Compatibility panel detects issues by comparing against official MDN compatibility data
+// at https://github.com/mdn/browser-compat-data). It uses a local snapshot of the dataset.
+// This dataset needs to be manually synchronized periodically
+
+// The subsets from the dataset required by the Compatibility panel are:
+// * css.properties: https://github.com/mdn/browser-compat-data/tree/master/css
+
+// The MDN compatibility data is available as a node package ("@mdn/browser-compat-data"),
+// which is used here to update `../dataset/css-properties.json`.
+
+/* global __dirname */
+
+"use strict";
+
+const compatData = require("@mdn/browser-compat-data");
+exportData(compatData.css.properties, "css-properties.json");
+
+function exportData(data, fileName) {
+  const fs = require("fs");
+  const path = require("path");
+
+  const content = `${JSON.stringify(data)}`;
+
+  fs.writeFile(
+    path.resolve(__dirname, "../dataset", fileName),
+    content,
+    err => {
+      if (err) {
+        console.error(err);
+      } else {
+        console.log(`${fileName} downloaded`);
+      }
+    }
+  );
+}
diff --git a/devtools/shared/compatibility/dataset/css-properties.json b/devtools/shared/compatibility/dataset/css-properties.json
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index 0000000000..06edd45c8c
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+++ b/devtools/shared/compatibility/dataset/css-properties.json
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+{"-moz-binding":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/-moz-binding","source_file":"css/properties/-moz-binding.json","status":{"deprecated":true,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"notes":["XBL is deprecated and being removed. See <a href='https://bugzil.la/1397874'>bug 1397874</a>.","Available only in chrome and UA style sheets."],"version_added":"1","version_removed":"67"},"firefox_android":{"notes":"Available only in chrome and UA style sheets.","version_added":"4","version_removed":"67"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"-moz-float-edge":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/-moz-float-edge","source_file":"css/properties/-moz-float-edge.json","status":{"deprecated":true,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"1"},"firefox_android":{"version_added":"4"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"-moz-force-broken-image-icon":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/-moz-force-broken-image-icon","source_file":"css/properties/-moz-force-broken-image-icon.json","status":{"deprecated":true,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"1"},"firefox_android":{"version_added":"4"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"-moz-image-region":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/-moz-image-region","source_file":"css/properties/-moz-image-region.json","status":{"deprecated":false,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"1"},"firefox_android":{"version_added":"4"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"-moz-orient":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/-moz-orient","source_file":"css/properties/-moz-orient.json","status":{"deprecated":false,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"6"},"firefox_android":{"version_added":"6"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}},"auto":{"__compat":{"description":"<code>auto</code> value","source_file":"css/properties/-moz-orient.json","status":{"deprecated":true,"experimental":false,"standard_track":false},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"notes":"The <code>auto</code> value was equivalent to <code>horizontal</code>.","version_added":"21","version_removed":"40"},"firefox_android":{"notes":"The <code>auto</code> value was equivalent to <code>horizontal</code>.","version_added":"21","version_removed":"40"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"inline_and_block":{"__compat":{"description":"<code>inline</code> and <code>block</code> 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<code>digits</code>.","partial_implementation":true,"version_added":"≤37"}]}},"digits":{"__compat":{"description":"<code>digits</code>","source_file":"css/properties/text-combine-upright.json","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":[{"version_added":"15","version_removed":"79"},{"alternative_name":"-ms-text-combine-horizontal","version_added":"12","version_removed":"79"}],"firefox":{"version_added":false},"firefox_android":{"version_added":false},"ie":{"alternative_name":"-ms-text-combine-horizontal","version_added":"11"},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}}},"text-decoration":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/text-decoration","source_file":"css/properties/text-decoration.json","spec_url":"https://w3c.github.io/csswg-drafts/css-text-decor/#text-decoration-property","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":"1"},"chrome_android":{"version_added":"18"},"edge":{"version_added":"12"},"firefox":{"version_added":"1"},"firefox_android":{"version_added":"4"},"ie":{"version_added":"3"},"oculus":{"version_added":"5.0"},"opera":{"version_added":"3.5"},"opera_android":{"version_added":"10.1"},"safari":{"version_added":"1"},"safari_ios":{"version_added":"1"},"samsunginternet_android":{"version_added":"1.0"},"webview_android":{"version_added":"≤37"}}},"blink":{"__compat":{"description":"<code>blink</code>","source_file":"css/properties/text-decoration.json","status":{"deprecated":true,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"1","version_removed":"23"},"firefox_android":{"version_added":"4","version_removed":"23"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":"4","version_removed":"15"},"opera_android":{"version_added":"10.1","version_removed":"14"},"safari":{"version_added":"preview"},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"shorthand":{"__compat":{"description":"Shorthand","source_file":"css/properties/text-decoration.json","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":"57"},"chrome_android":{"version_added":"57"},"edge":{"version_added":"79"},"firefox":{"version_added":"6"},"firefox_android":{"version_added":"6"},"ie":{"version_added":false},"oculus":{"version_added":"5.0"},"opera":{"version_added":"44"},"opera_android":{"version_added":"43"},"safari":{"prefix":"-webkit-","version_added":"8"},"safari_ios":{"prefix":"-webkit-","version_added":"8"},"samsunginternet_android":{"version_added":"7.0"},"webview_android":{"version_added":"57"}}}},"text-decoration-thickness":{"__compat":{"description":"<code>text-decoration-thickness</code> 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The deprecated <code>distribute</code> value is also supported.","version_added":"12"},"firefox":{"version_added":"55"},"firefox_android":{"version_added":"55"},"ie":{"notes":"Standard values <code>inter-character</code> and <code>none</code> are supported. The deprecated <code>distribute</code> value is also supported.","version_added":"11"},"oculus":{"flags":[{"name":"#enable-experimental-web-platform-features","type":"preference","value_to_set":"true"}],"notes":"<code>inter-word</code> and <code>distribute</code> (deprecated) values are supported, but <code>distribute</code> behavior is buggy.","version_added":"5.0"},"opera":{"flags":[{"name":"#enable-experimental-web-platform-features","type":"preference","value_to_set":"true"}],"notes":"<code>inter-word</code> and <code>distribute</code> (deprecated) values are supported, but <code>distribute</code> behavior is buggy.","version_added":"19"},"opera_android":{"version_added":false},"safari":{"notes":"See <a href='https://webkit.org/b/99945'>bug 9945</a>.","version_added":false},"safari_ios":{"notes":"See <a href='https://webkit.org/b/99945'>bug 9945</a>.","version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"text-orientation":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/text-orientation","source_file":"css/properties/text-orientation.json","spec_url":"https://w3c.github.io/csswg-drafts/css-writing-modes/#text-orientation","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":[{"version_added":"48"},{"prefix":"-webkit-","version_added":"11"}],"chrome_android":[{"version_added":"48"},{"prefix":"-webkit-","version_added":"18"}],"edge":[{"version_added":"79"},{"prefix":"-webkit-","version_added":"79"}],"firefox":{"version_added":"41"},"firefox_android":{"version_added":"41"},"ie":{"version_added":false},"oculus":[{"version_added":"5.0"},{"prefix":"-webkit-","version_added":"5.0"}],"opera":[{"version_added":"35"},{"prefix":"-webkit-","version_added":"15"}],"opera_android":[{"version_added":"35"},{"prefix":"-webkit-","version_added":"14"}],"safari":[{"version_added":"14"},{"prefix":"-webkit-","version_added":"5.1"}],"safari_ios":[{"version_added":"14"},{"prefix":"-webkit-","version_added":"5"}],"samsunginternet_android":[{"version_added":"5.0"},{"prefix":"-webkit-","version_added":"1.0"}],"webview_android":[{"version_added":"48"},{"prefix":"-webkit-","version_added":"≤37"}]}},"sideways":{"__compat":{"description":"<code>sideways</code>","source_file":"css/properties/text-orientation.json","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"notes":"<code>sideways-right</code> has become an alias of <code>sideways</code>.","version_added":"44"},"firefox_android":{"notes":"<code>sideways-right</code> has become an alias of <code>sideways</code>.","version_added":"44"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":"7"},"safari_ios":{"version_added":"7"},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}}},"text-overflow":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/text-overflow","source_file":"css/properties/text-overflow.json","spec_url":"https://w3c.github.io/csswg-drafts/css-overflow/#text-overflow","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":"1"},"chrome_android":{"version_added":"18"},"edge":{"version_added":"12"},"firefox":{"notes":"Until Firefox 10, handling of <code>text-overflow</code> on blocks with inline overflow on both horizontal sides was incorrect. Before Firefox 10, if only one value was specified (such as <code>text-overflow: ellipsis;</code>), text was ellipsed on both sides of the block, instead of only the end edge based on the block's text direction.","version_added":"7"},"firefox_android":{"notes":"Until Firefox 10, handling of <code>text-overflow</code> on blocks with inline overflow on both horizontal sides was incorrect. Before Firefox 10, if only one value was specified (such as <code>text-overflow: ellipsis;</code>), text was ellipsed on both sides of the block, instead of only the end edge based on the block's text direction.","version_added":"7"},"ie":[{"version_added":"6"},{"prefix":"-ms-","version_added":"8"}],"oculus":{"version_added":"5.0"},"opera":[{"version_added":"11"},{"prefix":"-o-","version_added":"9","version_removed":"15"}],"opera_android":[{"version_added":"11"},{"prefix":"-o-","version_added":"10.1","version_removed":"14"}],"safari":{"version_added":"1.3"},"safari_ios":{"version_added":"1"},"samsunginternet_android":{"version_added":"1.0"},"webview_android":{"version_added":"≤37"}}},"string":{"__compat":{"description":"&lt;string&gt;","source_file":"css/properties/text-overflow.json","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"9"},"firefox_android":{"version_added":"9"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}},"two_value_syntax":{"__compat":{"description":"Two-value syntax","source_file":"css/properties/text-overflow.json","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":false},"chrome_android":{"version_added":false},"edge":{"version_added":false},"firefox":{"version_added":"9"},"firefox_android":{"version_added":"9"},"ie":{"version_added":false},"oculus":{"version_added":false},"opera":{"version_added":false},"opera_android":{"version_added":false},"safari":{"version_added":false},"safari_ios":{"version_added":false},"samsunginternet_android":{"version_added":false},"webview_android":{"version_added":false}}}}},"text-rendering":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/text-rendering","source_file":"css/properties/text-rendering.json","spec_url":"https://svgwg.org/svg2-draft/painting.html#TextRenderingProperty","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"notes":["This property is only supported on Windows and Linux.","Initial versions had bugs on Windows and Linux that broke <a href='https://crbug.com/114719'>font substitution</a>, <a href='https://crbug.com/51973'>small-caps</a>, <a href='https://crbug.com/55458'>letter-spacing</a> or caused <a href='https://crbug.com/149548'>text to overlap</a>."],"version_added":"4"},"chrome_android":{"notes":["This property is only supported on Windows and Linux.","Initial versions had bugs on Windows and Linux that broke <a href='https://crbug.com/114719'>font substitution</a>, <a href='https://crbug.com/51973'>small-caps</a>, <a href='https://crbug.com/55458'>letter-spacing</a> or caused <a href='https://crbug.com/149548'>text to overlap</a>."],"version_added":"18"},"edge":{"notes":["This property is only supported on Windows and Linux.","Initial versions had bugs on Windows and Linux that broke <a href='https://crbug.com/114719'>font substitution</a>, <a href='https://crbug.com/51973'>small-caps</a>, <a href='https://crbug.com/55458'>letter-spacing</a> or caused <a href='https://crbug.com/149548'>text to overlap</a>."],"version_added":"79"},"firefox":{"notes":["This property is only supported on Windows and Linux.","The <code>optimizeSpeed</code> option has no effect on Firefox 4 because the standard code for text rendering is already fast and there is not a faster code path at this time. See <a href='https://bugzil.la/595688'>bug 595688</a> for details."],"version_added":"1"},"firefox_android":{"version_added":"46"},"ie":{"version_added":false},"oculus":{"notes":["This property is only supported on Windows and Linux.","Initial versions had bugs on Windows and Linux that broke <a href='https://crbug.com/114719'>font substitution</a>, <a href='https://crbug.com/51973'>small-caps</a>, <a href='https://crbug.com/55458'>letter-spacing</a> or caused <a href='https://crbug.com/149548'>text to overlap</a>."],"version_added":"5.0"},"opera":{"version_added":"15"},"opera_android":{"version_added":"14"},"safari":{"version_added":"5"},"safari_ios":{"version_added":"4.2"},"samsunginternet_android":{"notes":"This property is only supported on Windows and Linux. Samsung Internet is not on Windows or Linux.","version_added":"1.0"},"webview_android":{"notes":"From version 3 to 4.3, there is a serious bug where <code>text-rendering: optimizeLegibility</code> causes custom web fonts to not render. This was fixed in version 4.4.","version_added":"3"}}},"auto":{"__compat":{"description":"<code>auto</code>","source_file":"css/properties/text-rendering.json","status":{"deprecated":false,"experimental":false,"standard_track":false},"support":{"chrome":{"notes":"Chrome treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"4"},"chrome_android":{"notes":"Chrome treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"18"},"edge":{"notes":"Edge treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"79"},"firefox":{"notes":"If the font size is 20 pixels or higher, Firefox treats <code>auto</code> as <code>optimizeLegibility</code>. For smaller text, Firefox treats <code>auto</code> as <code>optimizeSpeed</code>. The 20-pixel threshold can be changed with the <code>browser.display.auto_quality_min_font_size</code> preference.","version_added":"1"},"firefox_android":{"notes":"If the font size is 20 pixels or higher, Firefox treats <code>auto</code> as <code>optimizeLegibility</code>. For smaller text, Firefox treats <code>auto</code> as <code>optimizeSpeed</code>. The 20-pixel threshold can be changed with the <code>browser.display.auto_quality_min_font_size</code> preference.","version_added":"46"},"ie":{"version_added":false},"oculus":{"notes":"Chrome treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"5.0"},"opera":{"notes":"Opera treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"15"},"opera_android":{"notes":"Opera treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"14"},"safari":{"notes":"Safari treats <code>auto</code> as <code>optimizeSpeed</code>. See <a href='https://webkit.org/b/41363'>WebKit bug 41363</a>.","version_added":"5"},"safari_ios":{"notes":"Safari treats <code>auto</code> as <code>optimizeSpeed</code>. See <a href='https://webkit.org/b/41363'>WebKit bug 41363</a>.","version_added":"4.2"},"samsunginternet_android":{"notes":"Samsung Internet treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"1.0"},"webview_android":{"notes":"WebView treats <code>auto</code> as <code>optimizeSpeed</code>.","version_added":"≤37"}}}},"geometricPrecision":{"__compat":{"description":"<code>geometricPrecision</code>","source_file":"css/properties/text-rendering.json","status":{"deprecated":false,"experimental":false,"standard_track":false},"support":{"chrome":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"13"},"chrome_android":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"18"},"edge":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"79"},"firefox":{"notes":"Firefox treats <code>geometricPrecision</code> the same as <code>optimizeLegibility</code>.","version_added":"1"},"firefox_android":{"notes":"Firefox treats <code>geometricPrecision</code> the same as <code>optimizeLegibility</code>.","version_added":"46"},"ie":{"version_added":false},"oculus":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"5.0"},"opera":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"15"},"opera_android":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"14"},"safari":{"version_added":"6"},"safari_ios":{"version_added":"6"},"samsunginternet_android":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"1.0"},"webview_android":{"notes":"Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.","version_added":"37"}}}}},"text-shadow":{"__compat":{"mdn_url":"https://developer.mozilla.org/docs/Web/CSS/text-shadow","source_file":"css/properties/text-shadow.json","spec_url":"https://w3c.github.io/csswg-drafts/css-text-decor/#text-shadow-property","status":{"deprecated":false,"experimental":false,"standard_track":true},"support":{"chrome":{"version_added":"2"},"chrome_android":{"version_added":"18"},"edge":{"version_added":"12"},"firefox":{"notes":["Firefox versions before 57 have a bug whereby <a href='https://developer.mozilla.org/docs/Web/CSS/transition'><code>transition</code></a>s will not work when transitioning from a <code>text-shadow</code> with a color specified to a <code>text-shadow</code> without a color specified (<a href='https://bugzil.la/726550'>bug 726550</a>).","From Firefox 4, the blur radius is capped at 300 for performance reasons.","Firefox theoretically supports infinite text-shadows (don't try it).","If the <code>&lt;color&gt;</code> value is unspecified, then Firefox uses the value of the element's <a href='https://developer.mozilla.org/docs/Web/CSS/color'><code>color</code></a> property."],"version_added":"3.5"},"firefox_android":{"notes":["Firefox versions before 57 have a bug whereby <a href='https://developer.mozilla.org/docs/Web/CSS/transition'><code>transition</code></a>s will not work when transitioning from a <code>text-shadow</code> with a color specified to a <code>text-shadow</code> without a color specified (<a href='https://bugzil.la/726550'>bug 726550</a>).","From Firefox 4, the blur radius is capped at 300 for performance reasons.","Firefox theoretically supports infinite text-shadows (don't try it).","If the <code>&lt;color&gt;</code> value is unspecified, then Firefox uses the value of the element's <a href='https://developer.mozilla.org/docs/Web/CSS/color'><code>color</code></a> property."],"version_added":"4"},"ie":{"version_added":"10"},"oculus":{"version_added":"5.0"},"opera":{"notes":["Opera supports a maximum of 6-9 text-shadows for performance reasons. The blur radius is limited to 100px.","Opera 9.5 to 10.1 adheres to the old, reverse painting order (in CSS2, the first specified shadow is on the bottom)."],"version_added":"9.5"},"opera_android":{"version_added":"14"},"safari":{"notes":["In Safari, any shadows that do not explicitly specify a color are transparent.","Safari 1.1 to 3.2 only supports one text-shadow (displays the first shadow of a comma-separated list and ignores the rest). Safari 4.0 (WebKit 528) and later support multiple text-shadows."],"version_added":"1.1"},"safari_ios":{"notes":["In Safari, any shadows that do not explicitly specify a color are transparent.","Safari iOS 1 and 2 only support one text-shadow (displays the first shadow of a comma-separated list and ignores the rest). 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See <a href='https://bugzil.la/731536'>bug 731536</a>.","version_added":"4"},"ie":{"version_added":"4"},"oculus":{"version_added":"5.0"},"opera":{"version_added":"7"},"opera_android":{"version_added":"11"},"safari":{"version_added":"1"},"safari_ios":{"version_added":"1"},"samsunginternet_android":{"version_added":"1.0"},"webview_android":{"version_added":"4.4"}}}},"dutch_ij_digraph":{"__compat":{"description":"Dutch <code>IJ</code> 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\ No newline at end of file
diff --git a/devtools/shared/compatibility/dataset/moz.build b/devtools/shared/compatibility/dataset/moz.build
new file mode 100644
index 0000000000..6fb6046216
--- /dev/null
+++ b/devtools/shared/compatibility/dataset/moz.build
@@ -0,0 +1,9 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DevToolsModules(
+    "css-properties.json",
+)
diff --git a/devtools/shared/compatibility/moz.build b/devtools/shared/compatibility/moz.build
new file mode 100644
index 0000000000..be5594b6ea
--- /dev/null
+++ b/devtools/shared/compatibility/moz.build
@@ -0,0 +1,12 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += [
+    "dataset",
+]
+
+with Files("**"):
+    BUG_COMPONENT = ("DevTools", "Inspector: Compatibility")
diff --git a/devtools/shared/compatibility/package.json b/devtools/shared/compatibility/package.json
new file mode 100644
index 0000000000..f365b24719
--- /dev/null
+++ b/devtools/shared/compatibility/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "devtools-mdn-compat-data",
+  "version": "1.0.0",
+  "description": "Handle MDN compatibility data used by the Compatibility",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "update": "node bin/update"
+  },
+  "author": "",
+  "devDependencies": {
+    "@mdn/browser-compat-data": "^"
+  }
+}
\ No newline at end of file