Support HTML5 void elements

It would be great to be able to write standard HTML5 without needing to close tags like in JSX, which is just another small thing to learn for developers.

E.g: an image tag normally works but doesn’t in HTM: <img src="hi.png>.

[developit]

FWIW one of the reasons I don’t think we’re likely to consider this is because there are a lot of other HTML features that are unsupported in HTM. Adding a feature like void elements is net negative for performance, but it increases the likelihood of folks thinking HTM is an HTML parser. This assumption breaks down pretty quickly - attribute names are case-sensitive, whitespace is trimmed, etc.

HTM is also most often used with Virtual DOM libraries, which further diverge from HTML since they tend to adopt HTML’s property semantics for “props” rather than the string-only semantics of HTML attributes. We’ve actually had cases in Preact where folks using HTM have run into issues using namespaced attributes. VDOM doesn’t have those, and they’re only “supported” in HTM because it’s faster and smaller to pass-through namespaces than it would be to prevent their usage.

That all said, I do think it would be interesting for someone to resurrect the htm@1 codebase and repurpose it as a standalone HTML-to-VDOM library. It would be the fastest implementation, support 100% of HTML (since it uses DOMParser), and weigh in at around 300b. A library for that purpose wouldn’t need the tagged templates stuff, it would just be a string => VNode transformer.

[dy]

In case if you need htm-compatible API, have a look at xhtm https://github.com/spectjs/xhtm

On Tue, Sep 22, 2020 at 5:31 AM Kamil Tomšík [e-mail] wrote:

of folks thinking HTM is an HTML parser.

Of course it’s not, I’m using it only temporarily

BTW: @developit https://github.com/developit do you know about some small (well-formed is enough, speed is not an issue) HTML parsers?

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