PDF documents are ubiquitous and therefore need to be accessible to all. The ISO 32000 standard defines the PDF document format and includes specific features to enable PDF documents to be accessible. For example alternate text can be added...

I have written about Apple and accessiblity on many occasions, e.g. here, giving them a red card quite often but praising them when they added features that improved accessiblity of any product. My overall impression was Apple tried but...