Having identical titles leads to identical ids and anchors

[RGJ (Richard - Communiteq)]

@Canapin

The attributes’ values are based on the titles’ contents, so identical titles will have identical id and data-d-toc attributes:

Exactly, so this is not an inherent limitation of HTML (actually, having identical id’s in a single document is a violation of the spec) but a bug in the theme component.

I guess this

const suffix = slugify(h.textContent) || index;
const id = h.getAttribute("id") || slugify(`toc-${h.nodeName}-${suffix}`);

needs to be something like

const suffix = slugify(h.textContent) || '';
const id = h.getAttribute("id") || slugify(`toc-${h.nodeName}-${suffix}-${index}`);