ENH: Add alternative html for Styler tooltips

[Delengowski]

Feature Type

• Adding new functionality to pandas

• Changing existing functionality in pandas

• Removing existing functionality in pandas

Problem Description

Currently pandas.io.formats.style.Styler.set_tooltips works by adding a <span> tags around <td> elements. The <span> is hidden by default and upon hover of the corresponding cell in the rendered table, the contents is replaced by that of the <span>.

The issue is, if the contents of the <span> is too large it is not all shown because it goes outside of the <td> element.

Feature Description

I propose adding an option to pandas.io.formats.style.Styler.set_tooltips to instead add the tooltip as a title attribute of <td title=''>. To my understanding the use of title attribute is the canonical way to add tooltips to <td> elements.

Alternative Solutions

Don't use pandas.io.formats.style.Styler.set_tooltips and instead manually manipulate the rendered html after the fact with beautifulsoup4.

Additional Context

No response

[Delengowski]

@attack68

[attack68]

Using span on hover gives a lot of flexibility to the style of tooltip. I do not believe you get this with the title approach. However that might also have other benefits. Happy to review tjis addition if you propose it, provided it is not the default case.