Mermaid drawings not rendering due to "<svg> attribute viewBox: Expected number, "0 0 -Infinity -Infin…"

In gitlab-com/migration#20 (comment 54606798), I don't see Mermaid drawings due to:

Sample drawing

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
    D-->E;