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feat: <sup> and <sub> support (#2131)

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## Summary

* **What is the goal of this PR?** Support for `<sup>` and `<sub>` tags.

## Additional Context

This isn't my work, but @jpirnay 's (missing you here, man!). I migrated
his work from
https://github.com/jpirnay/crosspoint-reader/commit/bcd8c32cf26447ccc792cfedd2fdbfce4fee5210
with some micro-optimizations.

Screenshots: 

[Subscript-and-Superscript-Tests_ch2_p1_10pct_55632.bmp](https://github.com/user-attachments/files/28196936/Subscript-and-Superscript-Tests_ch2_p1_10pct_55632.bmp)

[Subscript-and-Superscript-Tests_ch3_p1_21pct_77473.bmp](https://github.com/user-attachments/files/28196937/Subscript-and-Superscript-Tests_ch3_p1_21pct_77473.bmp)


---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< YES >**_

---------

Co-authored-by: jpirnay <jens@pirnay.com>
Co-authored-by: Julia <julia@uxj.io>
This commit is contained in:
Uri Tauber
2026-05-26 12:38:40 -04:00
committed by GitHub
co-authored by jpirnay Julia
parent 34e923d722
commit c5e861d71c
11 changed files with 443 additions and 18 deletions
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lib/Epub/Epub/css/CssParser.h
+1 -1
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@@ -31,7 +31,7 @@
class CssParser {
public:
// Bump when CSS cache format or rules change; section caches are invalidated when this changes
static constexpr uint8_t CSS_CACHE_VERSION = 4;
static constexpr uint8_t CSS_CACHE_VERSION = 5;
explicit CssParser(std::string cachePath) : cachePath(std::move(cachePath)) {}
~CssParser() = default;