Web page watermark protection: Respond to hidden browser elements
When designing web page watermarks, in addition to preventing tampering, you also need to consider the browser's ability to hide elements. Users can easily hide elements through the right-click menu of the browser. This article explores how to prevent this behavior, as well as events and style changes triggered by element hiding.
First, in order to prevent users from debugging code through browser developer tools, you can try the following methods to prevent access to developer tools:
-
Disable right-click and F12: Prevent users from opening developer tools by listening to keyboard and right-click events.
// F12 is prohibited document.addEventListener('keydown', e => { if (e.keyCode === 123) e.preventDefault(); }); // Prohibit the right-click menu document.addEventListener('contextmenu', e => e.preventDefault());
-
Monitor page size changes: The browser window size changes can be used to detect whether the developer tool is open. When the size difference between the visual area and the browser window exceeds the threshold, the developer tool is considered to be open.
function checkConsole() { const threshold = 200; const widthDiff = window.outerWidth - window.innerWidth; const heightDiff = window.outerHeight - window.innerHeight; if (widthDiff > threshold || heightDiff > threshold) { console.log('Developer Tools may be open'); // Add corresponding treatment here, such as warning users or taking other measures} } window.addEventListener('resize', checkConsole); checkConsole();
-
Use
debugger
statements to infinite recursion (not recommended): This method does not directly detect the developer tool, but usesdebugger
statements and recursive calls to cause the browser to get stuck when the developer tool is opened. This method is extremely unrecommended because it can seriously affect the user experience and even cause browser crashes.// This method is not recommended as it can seriously affect the user experience and may cause browser crashes. // Do not use this code in production environment.
The above method is not foolproof, there is always a possibility of being bypassed. A more reliable way is to convert the entire web page into an image, completely preventing the user from removing the watermark elements. Choosing the right strategy depends on the balance of security needs and user experience.
The above is the detailed content of How to prevent elements in the browser from being hidden?. For more information, please follow other related articles on the PHP Chinese website!

TheroottaginanHTMLdocumentis.Itservesasthetop-levelelementthatencapsulatesallothercontent,ensuringproperdocumentstructureandbrowserparsing.

The article explains that HTML tags are syntax markers used to define elements, while elements are complete units including tags and content. They work together to structure webpages.Character count: 159

The article discusses the roles of <head> and <body> tags in HTML, their impact on user experience, and SEO implications. Proper structuring enhances website functionality and search engine optimization.

The article discusses the differences between HTML tags , , , and , focusing on their semantic vs. presentational uses and their impact on SEO and accessibility.

Article discusses specifying character encoding in HTML, focusing on UTF-8. Main issue: ensuring correct display of text, preventing garbled characters, and enhancing SEO and accessibility.

The article discusses various HTML formatting tags used for structuring and styling web content, emphasizing their effects on text appearance and the importance of semantic tags for accessibility and SEO.

The article discusses the differences between HTML's 'id' and 'class' attributes, focusing on their uniqueness, purpose, CSS syntax, and specificity. It explains how their use impacts webpage styling and functionality, and provides best practices for

The article explains the HTML 'class' attribute's role in grouping elements for styling and JavaScript manipulation, contrasting it with the unique 'id' attribute.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version
Useful JavaScript development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Dreamweaver Mac version
Visual web development tools

Atom editor mac version download
The most popular open source editor
