There is no difference, as seen in the source code, line 30 & line 121:
/* Line 30*/
rsingleTag = /^<(w+)s*/?>(?:</1>)?$/,
/* Line 121 */
// If a single string is passed in and it's a single tag
// just do a createElement and skip the rest
ret = rsingleTag.exec( selector );
The following are equivalent:
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…