manten-summer.js

document.body.addEventListener('keydown', e => {
    const el =  [...document.querySelectorAll('.QuestionTxt')].find(qt=>!qt.querySelector('li.on'))
    if (e.key === 'ArrowLeft') {
        el.querySelector('a img[alt="○"]').click()
        el.querySelector('[alt="次の問題へ"]').click()
    } else if (e.key === 'ArrowRight') {
        el.querySelector('a img[alt="×"]').click()
        el.querySelector('[alt="次の問題へ"]').click()
        
    }
})