Investigate the polyfill's handling of inline grid vs grid. Look at the source code in the repository, particularly the part that sets display values. Check if there is a distinction between grid and inline grid in the polyfill implementation. The issue asks that inline grid should wrap content instead of filling parent width, so understanding how the polyfill computes widths is key. There are no linked PRs, so start by examining the main JavaScript files for CSS grid property handling.
inline-grid behaves the same as grid · FremyCompany/css-grid-polyfill#42 | Good First Issue