<h3>me selecione para que eu te salve na variavel fera :D</h3>
<p>Texto selecionado foi: <span id="ultimoTexto"></span>
</p>
JavaScript
//declaro variavel para guardar seu texto
var textoSelecionado = '';
/*pega todos eventos de click, lembrando que
o evento de click ele é trigado quando o botão é solto.
*/
document.body.addEventListener('click', pegarTexto, true);
/*metodo chamado pela função de click*/
function pegarTexto() {
/*busca todos os texto selecionados na tela*/
var selecionado = window.getSelection().toString();
/*verifica se o evento é de seleção*/
if (selecionado) {
/*seta na sua variavel que deve estar na sua extensão*/
textoSelecionado = selecionado;
document.getElementById('ultimoTexto').innerHTML = selecionado;
}
}
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