Bug: vivliostyle parses incorrect syntax for ellipse

[MoamenAbdelsattar]

After looking at Apollo 8 sample source code, I found that vivliostyle parses incorrect syntax for ellipse, which is -epubx-shape-outside: ellipse(50%, 55%, 46%, 46%);. After correcting it to the correct syntax ellipse(44% 40% at 51% 54%), vivliostyle.js didn't parse it correctly;

[MurakamiShinyu]

Thanks for the report. The -epubx- properties were made long time ago in https://github.com/sorotokin/adaptive-layout/ and Vivliostyle.js inherited it.

Indeed, currently modern browsers support shape-outside and the old -epubx-shape-outside implementation should be no longer necessary. I will consider fixing it.