shikaku https://blog.hatena.ne.jp/shikaku/ shikaku's blog https://blog.systemjp.net/ HTML HTML5なら placeholder <input type="text" placeholder="数値を入力してください。"> ネタ元 https://so-zou.jp/web-app/tech/programming/javascript/sample/watermark.htm 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.systemjp.net%2Fentry%2F2018%2F02%2F19%2F095409" title="テキストボックスに透かし文字を表示 - shikaku&#39;s blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2018-02-19 09:54:09 rich https://blog.systemjp.net/entry/2018/02/19/095409 1.0 100%