Missing Markdown support: horizontal rule, emojis

[jackwhelpton]

Environment

• KFP version: 1.0.1

Steps to reproduce

Output a markdown artifact containing the missing features: a horizontal rule, and an emoji, e.g. :warning:

        metadata = {
          "outputs": [
          {
            "storage": "inline",
            "source": "line1\n---\n:warning: Item had multiple genre labels",
            "type": "markdown",
          }]
        }

Expected result

The Visualizations tab and Run output should render the horizontal rule and emoji:

line1

⚠️ Item had multiple genre labels

Instead, the original markup code is visible:

line1 --- :warning: Item had multiple genre labels

---

Impacted by this bug? Give it a 👍. We prioritise the issues with the most 👍.