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HTML 属性：placeholder - HTML（超文本标记语言） | MDN
HTML 属性：placeholder placeholder 属性定义了当表单控件没有值时在控件中显示的文本。占位符文本应简要提示用户应向控件输入的预期数据类型。有效的占位符文本包括暗示预期数据类型的单词或短语，而不是解释或提示。不得使用占位符代替 <label>。
HTML input placeholder 属性 | 菜鸟教程
定义和用法 placeholder 属性规定可描述输入字段预期值的简短的提示信息（比如：一个样本值或者预期格式的短描述）。该提示会在用户输入值之前显示在输入字段中。注意： placeholder 属性适用于下面的 input 类型：text、search、url、tel、email 和 password。
图文详解placeholder属性的使用方法以及如何修改placeholder的默认样式 - 知乎
在页面布局时经常会用到input输入框，有时为了提示用户输入正确的信息，需要用placeholder属性加以说明。这篇文章就和大家讲讲placeholder属性怎么用以及如何修改placeholder属性的样式，感兴趣的朋友可以参考一下，希望对你有所帮助！
Placehold | A simple, fast and free image placeholder service
Placehold is a simple, fast and free image placeholder service to generate SVG, PNG, JPEG, GIF, WebP and AVIF placeholder images for your project
PLACEHOLDER | English meaning - Cambridge Dictionary
PLACEHOLDER definition: 1 a piece of text or an image that is put in a document temporarily before the final text or image… Learn more
Placeholder images, Demo photos for website
Placeholder photos are used by designers or developers to visualize a design or layout before the final image is replaced A placeholder image is essentially a substitute image used in website or application design while the actual images are being created or are not yet available
PLACEHOLDER Definition Meaning - Merriam-Webster
The meaning of PLACEHOLDER is a person or thing that occupies the position or place of another person or thing How to use placeholder in a sentence
HTML 属性：placeholder - HTML | MDN - MDN 文档
The placeholder attribute defines the text displayed in a form control when the control has no value The placeholder text should provide a brief hint to the user as to the expected type of data that should be entered into the control