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This tutorial explores the problem of crawling failure if JavaScript dynamically loads content when crawling URLs from web pages using the R language rvest package. The article explains in detail why traditional HTML parsing methods may be invalid and provides an efficient solution: by identifying and directly calling the API interface behind the web page, using the httr package to obtain JSON data, thereby successfully extracting the required information.

To disable HTML form elements, you can use the disabled attribute, which can prevent user interaction and the element value will not be submitted with the form. This attribute is of a Boolean type and can be directly added to form element tags such as input, textarea, select, or button. For example, it can also be dynamically controlled through JavaScript, such as document.getElementById("myInput").disabled=true. If the element cannot be edited but the value is still submitted, you should use the readonly attribute. The disabled attribute is simple and effective and widely supported.

Create an HTML button and set the click event to call the JavaScript function; 2. Use CSS to pin the button to the lower right corner of the page and set the hidden default state; 3. Listen to the scroll event through JavaScript, and display the button when the scroll distance exceeds 300px, and scroll smoothly to the top when clicked. Finally, a return to the top button to improve the user experience is realized, and the full functionality is completed in collaboration with HTML, CSS and JavaScript.

TolinktoaspecificpartofapageusinganchorsinHTML,assignauniqueidtothetargetelement,suchas,thencreateahyperlinkwithhref="#section1"toscrolltothatsection,andforcross-pagelinking,usethefullURLlikepage.html#section1,ensuringsmoothnavigationwithou

Theactionattributespecifieswheretosendtheformdata,andthemethodattributedefineshowtosenditusingHTTPmethods.1.TheactionattributesetsthedestinationURL(absoluteorrelative);ifomitted,theformsubmitstothecurrentpage.2.Themethodattributeuses"get"to

This article details how to use CSS to achieve transparent and floating custom scroll bars on content. By combining overflow: overlay; attributes and scrollbar pseudo-element styles for different browsers (WebKit/Firefox), you can precisely control the color, transparency, width and rounded corners of scrollbars, thereby improving the visual consistency and user experience of the web interface.

Use it to create line-breaking spaces in HTML, such as preventing the display of numbers and unit branches; 1. Used to avoid breaking lines between names, values ​​and units; 2. Maintain the text format within the line; 3. It can be used as a blank placeholder, but CSS is recommended; other space characters such as  ,  , etc. are suitable for special scenarios, but in most cases it is sufficient; be careful not to abuse the layout, CSS should be used instead, and multiple will not be merged, and the screen reader can recognize it normally, so it is necessary to use reasonably to ensure the text is displayed coherently.

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