Why is Resizing a Specific SVG Not Working with CSS? Let's Find Out!

Discover the common pitfalls of resizing SVGs with CSS and learn how to effectively adjust the dimensions of your SVG images using the correct attributes.
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This video is based on the question https://stackoverflow.com/q/66476725/ asked by the user 'Laure PROTHAIS' ( https://stackoverflow.com/u/14749639/ ) and on the answer https://stackoverflow.com/a/66476979/ provided by the user 'Paul LeBeau' ( https://stackoverflow.com/u/1292848/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Why is Resizing a Specific SVG Not Working with CSS? Let's Find Out!

If you've tried to resize an SVG using CSS and found that it doesn’t work as expected, you’re not alone. Many developers encounter similar issues when dealing with SVG images. Let's explore a specific case to understand the underlying problems and how to fix them effectively.

The Problem: SVG Resizing Issues

In many web projects, SVG images are used for their scalability and clarity. However, a question that often arises is why certain SVGs seem unresponsive to CSS styling while others work just fine. For instance, if you have an SVG defined inside a class, like .tag-buy, and you attempt to set its width and height to 60px directly in CSS but it does not reflect those changes, something is amiss.

Example Scenario

In an example setup, the SVG in the .tag-buy class fails to resize properly, while an SVG in the .tag-work class behaves correctly, despite their similarities. The expectation was to apply uniform dimensions of 60px, but the results suggest a deeper issue.

The Solution: Understanding viewBox and Case Sensitivity

The Role of viewBox

The primary reason for the resizing issue stems from an incorrectly defined viewBox attribute. In SVG, the viewBox attribute is crucial as it specifies the position and size of the SVG viewport. When this attribute is incorrectly written (for example, using the lowercase "viewbox" instead of the correct "viewBox"), the SVG may fail to render the dimensions properly in certain circumstances, especially when parsed as XML rather than HTML.

Key Points about viewBox

Case Sensitivity: SVG attributes are case-sensitive. Always ensure that attributes like viewBox are written correctly.

Parsing Differences: Inline SVGs are parsed with HTML rules, which are more forgiving of case errors, unlike externally loaded SVGs which adhere to strict XML parsing rules.

How to Fix the Issue

Correct the Attribute:

Ensure that you are using viewBox instead of viewbox. This simple error can lead to complications when resizing.

For example, modify your SVG like so:

[[See Video to Reveal this Text or Code Snippet]]

Test Your Changes:

After making the correction, check your CSS again. The classes that were not responding should now properly reflect the heights and widths defined.

Use Consistent Styles:

Make sure that all your SVGs use consistent styling methods across your project to avoid discrepancies.

Conclusion: Common Mistakes and Best Practices

When it comes to SVGs, paying attention to detail and the precise syntax can save you a lot of trouble. Always remember that:

The viewBox attribute is critical for proper scaling.

SVG parsing rules differ from HTML, so correctness matters.

Regular testing after changes ensures that everything works as intended.

By following these guidelines, you should be able to effectively manage your SVG sizes with CSS, achieving that perfect look across all your web designs.

Happy coding!

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