Bug summary

canvas.manager.set_window_title does not work to figure withWebAgg backend (but MacOSX). the title is stillFigure 1 by default.

Code for reproduction

importmatplotlib.pyplotaspltimportnumpyasnpimportmatplotlibmatplotlib.use("WebAgg")fig=plt.figure(figsize=(7,5))fig.canvas.manager.set_window_title("My figure")ax=fig.add_subplot(111)dx,dy=0.05,0.05y,x=np.mgrid[slice(1,5+dy,dy),slice(1,5+dx,dx)]z=np.sin(x)**10+np.cos(10+y*x)*np.cos(x)cf=ax.contourf(x+dx/2.,y+dy/2.,z)fig.colorbar(cf,ax=ax)plt.show()

Actual outcome

Expected outcome

Additional information

it works in MacOSX backends

Operating system

macOS Sequoia 15.1.1

Matplotlib Version

3.9.3

Matplotlib Backend

WebAgg

Python version

3.12.7

Jupyter version

No response

Installation

pip