Description

As plotly is responsive there's currently no way to place both legend and title on the top of the chart so that title and legend do not overlap (seems legend doesn't take into account title/subtitle). I know I have some tools which can help (like setting top margin/playing with y/maxheight/yref) but all of them aren't reliable as resizing the window (thus resizing the chart)/having long trace names/etc breaks all hardcoded configurations.

Steps to reproduce

Here's the demo: https://python-fiddle.com/examples/plotly?checkpoint=1757947390
Code behind it:

import plotly.express as px
df = px.data.gapminder().query("year==2007")
fig = px.scatter(df, x="gdpPercap", y="lifeExp", color="continent",
 size="pop", size_max=45, log_x=True)
fig.update_layout(legend=dict(
 orientation="h",
 entrywidth=70,
 yanchor="bottom",
 y=1.02,
 xanchor="center",
 x=1
))
fig.update_layout(title="Very long loong long long long title")
fig.show()

Notes

I'm posting python code here intentionally as I think this is the basic issue of the plotly.js rather than lack of configuration/bugs in Python wrapper.