The problem of setting border in table, and setting border in table

The problem of setting border in table, and setting border in table
Today, when I modified the table style, I wanted to add a border-bottom to tr. The color was relatively light at the beginning. I thought it was too long for my computer to be dazzled, after the result is changed to a deeper color, border-bottom does not come out. I suddenly remembered that I set the inline style for the table in the html code: border = "0". Will it be the reason? After the result is deleted, it still won't work. I flipped through the Forum, the answer is found. Set the table style:Border-collapse: collapse;Then you can set border-bottom for my tr element.