Title alignment seems inconsistent

[kanitw]

I'm using Vega-Lite spec to demonstrate the problem, but the issue is from the underlying title layout in Vega.

• Title with middle anchor is middle of the plotting view:

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "title": {"text": "A Simple Chart", "anchor": "middle"}, 
  "data": { 
    "values": [
      {"a": "A", "b": 28},
      {"a": "B", "b": 55},
      {"a": "C", "b": 43},
      {"a": "D", "b": 91},
      {"a": "E", "b": 81},
      {"a": "F", "b": 53},
      {"a": "G", "b": 19},
      {"a": "H", "b": 87},
      {"a": "I", "b": 52}
    ]
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "a", "type": "nominal"},
    "y": {"field": "b", "type": "quantitative"}
  }
}

However, changing anchor to "start" is the aligned to the whole canvas:

Users may want an option to align to the start of the plotting "view" as well.

[nsajko]

I think that "frame": "group" does what you want: https://vega.github.io/vega/docs/title/

[allisonwhilden]

Ahh. That does appear to work for me. Thanks!

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "title": {"text": "A Simple Chart", "frame": "group", "anchor": "start"}, 
  "data": { 
    "values": [
      {"a": "A", "b": 28},
      {"a": "B", "b": 55},
      {"a": "C", "b": 43},
      {"a": "D", "b": 91},
      {"a": "E", "b": 81},
      {"a": "F", "b": 53},
      {"a": "G", "b": 19},
      {"a": "H", "b": 87},
      {"a": "I", "b": 52}
    ]
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "a", "type": "nominal"},
    "y": {"field": "b", "type": "quantitative"}
  }
}

[joelostblom]

Would it make sense if the default was "frame": "group" for all values of anchor instead of that it changes depending on if anchor is "middle" or "left"?