Use `\tag{}` info for eq cross referencing in the HTML book output

In writing papers one sometimes needs to give an equation a special name, using the \tag{} command. A minimal example is as follows:

$$
a \ge b \tag{IC}
$${#eq-ic}

[Equation (-@eq-ic)] is nice.

The generated HTML book output made two 'mistakes'

• it uses both (1) and (IC) as equation tags
• More importantly, it uses 1 rather than IC for cross referencing.

Meanwhile, the PDF output is normal:

I wish to achieve the same output as in the PDF output. Is there any workaround?

I am using quarto 0.3.18 (I also have pandoc 2.17.0.1 installed, not sure whether this matters). Currently I work around by defining Pandoc metadata eq.ic: IC and then Equation {{< meta eq.ic >}}. It works well for me, both HTML and PDF. But I hope there is a more direct way to do this.

Reproduce the minimal equation example in an HTML book and compare its equation tag and cross-reference with the PDF output. Trace how the HTML output handles the LaTeX \tag{IC} and the equation label eq-ic; done means the HTML shows only (IC) and the cross-reference uses IC rather than 1.