<!DOCTYPE html> <html> <head> <meta charset=utf-8> <title>Bug xxxx</title> <style> .bmp { color: green; } .supp { color: blue; } </style> </head> <body> Line-breaking in the green (BMP) and blue (supplementary-plane) examples should match. <p class="bmp">abcdef<br>‘文’abcdef</p> <p class="supp">abcdef<br>‘𠀋’abcdef</p> </body> </html>