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Sigil Developer
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Quote:
Originally Posted by Doitsu
@KevinH
Out of curiosity, I tested an epub3 book with some elements that were at one point deprecated in XHTML.
epubveri flagged: big, center, font and strike.
However, EPUBCheck only flagged big and center.
EPUBCheck output:
Spoiler:
Code:
Validating using EPUB version 3.3 rules.
ERROR(RSC-005): OEBPS/Text/Section0001.xhtml(12,35): Error while parsing file: element "big" not allowed here; expected the element end-tag, text, element "a", "abbr", "area", "audio", "b", "bdi", "bdo", "br", "button", "canvas", "cite", "code", "data", "datalist", "del", "dfn", "em", "embed", "epub:switch", "i", "iframe", "img", "input", "ins", "kbd", "label", "link", "map", "mark", "meta", "meter", "ns1:math", "ns2:svg", "object", "output", "picture", "progress", "q", "ruby", "s", "samp", "script", "select", "slot", "small", "span", "strong", "sub", "sup", "template", "textarea", "time", "u", "var", "video" or "wbr" (with xmlns:ns1="http://www.w3.org/1998/Math/MathML" xmlns:ns2="http://www.w3.org/2000/svg") or an element from another namespace
ERROR(RSC-005): OEBPS/Text/Section0001.xhtml(14,11): Error while parsing file: element "center" not allowed here; expected the element end-tag, text, element "a", "abbr", "address", "area", "article", "aside", "audio", "b", "bdi", "bdo", "blockquote", "br", "button", "canvas", "cite", "code", "data", "datalist", "del", "details", "dfn", "dialog", "div", "dl", "em", "embed", "epub:switch", "epub:trigger", "fieldset", "figure", "footer", "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "i", "iframe", "img", "input", "ins", "kbd", "label", "link", "main", "map", "mark", "menu", "meta", "meter", "nav", "ns1:math", "ns2:svg", "object", "ol", "output", "p", "picture", "pre", "progress", "q", "ruby", "s", "samp", "script", "search", "section", "select", "slot", "small", "span", "strong", "sub", "sup", "table", "template", "textarea", "time", "u", "ul", "var", "video" or "wbr" (with xmlns:ns1="http://www.w3.org/1998/Math/MathML" xmlns:ns2="http://www.w3.org/2000/svg") or an element from another namespace
Would you agree that this is an actual EPUBCheck bug? |
Yes, it seems like it but whatwg (the living html spec group) only removed support for big, font, and center, whereas strike afaict is still just deprecated.
The funny thing is most modern browsers do not exactly implement the whatwg standard and they purposefully keep old tags around (ie. they deprecate them but do not remove them) to maintain pretty full backwards compatibility.
If the browsers did not do that, that whole whatwg house of cards would come down since a living standard moves too fast to be truly useful for anything over 5 years old.
For example our gumbo implementation of the whatwg spec includes all of them.
And luckily chrome / QtWebEngine has kept support for most of them. Because without that backwards compatibility, Sigil would soon have to drop support for most epub2 epubs and many early epub3 epubs since Preview would fail.
Browser devs luckily seem to understand backwards compatibility is very useful. Without isit most epub ereaders that support epub2 would be toast as the same webengine/webkit is used to display both epub2 and epub3.
Last edited by KevinH; 07-18-2026 at 01:43 PM.
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