STUDY_html_012_D.html
<html> <script> すくりぷと - 1 </script> <div align="center"> <iframe src="metronome_off.html"id="ぷれい80"width="232"height="384"></iframe> </div> <div align="center"> <form><input type="button"value="Play"onClick="newURL()"</form> <input type="button"value="Stop"id="りろーど"> </div> <script> すくりぷと - 2 </script> </html>
<script>
function newURL()
{document.getElementById("ぷれい80").src="metronome_on_80_BPM.html";}
</script>
<script>
let りろーど=document.getElementById("りろーど");
りろーど.addEventListener('click',function(){location.reload();});
</script>
STUDY_html_012 
[ 80_bpm.mp3 \ CENTER.svg \
fanfare_80.mp3 \ fanfare_analyze.jpg \ fanfare.jpg \
maru.svg \ metronome_off.html \ metronome_on_80_BPM.html \
metronome.svg \ sample_STUDY_html_012_D.html \
sample_STUDY_html_012_E.html ]
サンプル・ダウンロード 
