Edge 17 or older doesn't support custom filename for a[download] (#2946)

Author: saschanaz

html/elements/a.json

@@ -166,10 +166,19 @@
               "chrome_android": {
                 "version_added": null
               },
-              "edge": {
-                "version_added": "13",
-                "notes": "Until Edge 14 (build 14357), attempting to download data URIs caused Edge to crash (<a href='https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7160092/'>bug 7160092</a>)."
-              },
+              "edge": [
+                {
+                  "version_added": "18"
+                },
+                {
+                  "version_added": "13",
+                  "partial_implementation": true,
+                  "notes": [
+                    "Until Edge 14 (build 14357), attempting to download data URIs caused Edge to crash (<a href='https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7160092/'>bug 7160092</a>).",
+                    "Edge 17 or older didn't follow the attributes' value to determine filename (<a href='https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7260192/'>bug 7260192</a>)."
+                  ]
+                }
+              ],
               "edge_mobile": {
                 "version_added": true
               },