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Allowing users to adjust font size on a webpage
My goal is to create webpages where users can click an image to increase the font size of all content. Is this achievable? If so, how would I go about implementing it?
I am aware that browsers have built-in options for adjusting font sizes. However, I am looking for a solution that can be integrated directly into the page itself.
To accomplish this goal, follow these three steps:
Firstly, set the overall font size within the <body> tag. For instance:
body { font-size: 100%; }
Avoid using pixels to specify font size in any other part of the document.
p.somePara { font-size: 120%; }
p.anotherPara { font-size: 1.4em; }
Next, add an event handler to the image that will adjust the font size accordingly. You can achieve this using jQuery, like so:
$("#largerTextImage").click(function() {
$("body").css("fontSize", "120%");
});
And there you have it!
When you adjust the font size of a primary element such as <body>, that modified size will be passed down to its subordinate elements (unless conflicting CSS rules specify an absolute value, which could disrupt the user's ability to change the font size in their browser).
For more information on programmatically altering CSS values, check out this article.
In my opinion, a great way to update the look of your website is by switching up the CSS.
Try organizing all your font sizes in a separate CSS file. Then, create a duplicate of this file and adjust the font sizes according to your desired changes. To implement this, you can utilize a JavaScript script to easily switch between the two CSS files.
If you need guidance on how to do this, there are plenty of tutorials available online that provide detailed instructions. You may find this tutorial helpful.
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