Attach (recommended) or Link to PDF file here:
issue13500 (in test corpus)

This regressed when landing #13566. 

What is the expected behavior? (add screenshot)
<img width="664" alt="image" src="https://user-images.githubusercontent.com/942640/122467522-7bc8aa80-cf6f-11eb-9d4d-311eb7c64fb2.png">


What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/942640/122467565-85eaa900-cf6f-11eb-9c10-8a8686ed440c.png)


attributes.style.display = "flex";
        attributes.style.flexDirection = "column";
        switch (this.para.vAlign) {
          case "top":
            attributes.style.justifyContent = "start";
            break;
          case "bottom":
            attributes.style.justifyContent = "end";
            break;
          case "middle":
            attributes.style.justifyContent = "center";
            break;
        }
        const paraStyle = this.para[$toStyle]();
        if (!value.attributes.style) {
          value.attributes.style = paraStyle;
        } else {
          for (const [key, val] of Object.entries(paraStyle)) {
            if (!(key in value.attributes.style)) {
              value.attributes.style[key] = val;
            }
          }
        }
      }
    }
    return HTMLResult.success(createWrapper(this, html), bbox);
  }
}
class Edge extends XFAObject {