json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema",
      "type": "object",
      "required": [
          "context",
          "breakpoints"
      ],
      "properties": {
          "context": {
              "description": "Context element selector",
              "type": "string"
          },
          "breakpoints": {
              "description": "Breakpoints",
              "type": "array",
              "items": {
                  "type": "object",
                  "required": [
                      "name",
                      "size"
                  ],
                  "properties": {
                      "name": {
                          "description": "Breakpoint name",
                          "type": "string"
                      },
                      "size": {
                          "description": "Breakpoint viewport",
                          "type": "object",
                          "required": [
                              "width",
                              "height"
                          ],
                          "properties": {
                              "width": {
                                  "description": "Viewport width",
                                  "type": "integer"
                              },
                              "height": {
                                  "description": "Viewport height",
                                  "type": "integer"
                              }
                          }
                      }
                  }
              }
          }
      }
  }