The WBR element stands for Word BReak. This is for the very rare case when you have a NOBR section and you know exactly where you want it to break. Also, any time you want to give the browser help by telling it where a word is allowed to be broken. The WBR element does not force a line break (BR does that) it simply lets the browser know where a line break is allowed to be inserted if needed.

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<NOBR> Cu<SUP>2+</SUP> + 2 IO<SUB>3</SUB><SUP>-</SUP> + 12 H<SUP>+</SUP> + 12 I<SUP>-</SUP> -> <WBR>CuI<SUB>(s)</SUB> + 6.5 I<SUB>2</SUB> + 6 H<SUB>2</SUB>O </NOBR><P> Narrow the frame to break the line.

Cu2+ + 2 IO3- + 12 H+ + 12 I- -> CuI(s) + 6.5 I2 + 6 H2O Narrow the frame to break the line.