[NTG-context] Re: upload

[Pablo Rodriguez via ntg-context <ntg-context@ntg.nl>]

On 2/14/25 19:18, Hans Hagen wrote:
> On 2/14/2025 6:05 PM, Pablo Rodriguez via ntg-context wrote:
>> […]
>> With "Alt", these viewers seem to find no "cow" (using the previous
>> sample from Steffen): PDF.js, poppler (Evince/Okular), xpdf, mupdf-gl
>> (and SumatraPDF).
>>
>> With "ActualText", the compilant viewers are mupdf-gl (plus SumatraPDF),
>> poppler (Evince/Okular), xpdf. PDF.js has only an open issue
>> (https://github.com/mozilla/pdf.js/issues/12237).
>
> So should one set both?

Not for the same element, my fault.

> Does it hurt? I suppose one is used for speach
> and another for copy-paste and that viewers mix and match what they like
> here.

Alt is for speech and to replace non-textual elements. ActualText is
intended only for textual elements (text itself or images that contain
text).

> Could have the same values (when we set label)
>
> You can try to uncoment in lpdf-tag:
>
>               -- Alt        = alternate,
>
>           -- Alt  = pdfunicode(label ~= "" and label or "image"),
>
> irr we commented because some validator didn't like it but maybe we
> should not care about that too much. (Could also be under
> \enableexperiment control).

I will try to test this with the validators that come from the Arlington
PDF model.

BTW, ActualText doesn’t work in Edge (and I guess, Chrome [I don’t have
access to a computer with it installed]).

Many thanks for your help,

Pablo
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