仅能操作目标div的HTML时，如何为其中input设置样式（无CSS文件权限）
Since you can't access external CSS files or modify the <head>'s style tag, and only have permission to edit the HTML of the fileView_ctl01_D_STRT div, here are two reliable ways to get that yellow background on its nested input:
Approach 1: Inline Style Directly on the Input
If you can directly edit the input element's HTML (even if it's nested deep), this is the most browser-compatible method. Just add the style attribute directly to the input:
<div id="fileView_ctl01_D_STRT" class="intro"> <div> <div> <input style="background-color: yellow;"> </div> </div> </div>
This skips all external style dependencies and applies the background directly to the input element itself—no fancy selectors needed, just straightforward inline styling that works everywhere.
Approach 2: Embed a Style Tag Inside the Target Div
If the input is dynamically generated (so you can't edit its HTML directly) or you need to style multiple inputs inside this div, you can embed a <style> tag inside the target div. While <style> tags are typically placed in the <head>, HTML allows them in the <body> context too:
<div id="fileView_ctl01_D_STRT" class="intro"> <style> #fileView_ctl01_D_STRT input { background-color: yellow; } </style> <div> <div> <input> </div> </div> </div>
The id-based selector ensures the style only applies to inputs inside this specific div, and since it's embedded right there, you don't need to touch any external files or the document head. This works in all modern browsers; if you need support for very old browsers like IE8, stick with Approach 1.
内容的提问来源于stack exchange，提问作者aliihsan muhziroğlu
