HTMLDocument.registerElement is deprecated.

[Axelod]

Use customElements.define instead of document.registerElement see https://javascript.info/custom-elements

HTMLDocument.registerElement (file:///usr/lib/atom/static/index.js:166:12)
registerElement (/home/ernesto/.atom/packages/asciidoc-preview/node_modules/space-pen/lib/space-pen.js:66:88)
Builder.openTag (/home/ernesto/.atom/packages/asciidoc-preview/node_modules/space-pen/lib/space-pen.js:297:27)
Builder.tag (/home/ernesto/.atom/packages/asciidoc-preview/node_modules/space-pen/lib/space-pen.js:274:12)
Function.div (/home/ernesto/.atom/packages/asciidoc-preview/node_modules/space-pen/lib/space-pen.js:83:49)
Function.content (/home/ernesto/.atom/packages/asciidoc-preview/lib/asciidoc-preview-view.coffee:28:19)

[yoarch]

Same issue here under Archlinux everything up to date.