Differences in rendering with Google Chrome when zooming in or out

After creating some code, I observed a peculiar issue. At 500% zoom, the DOWNLOAD button aligns perfectly with the left wall without any gap. However, upon reducing the zoom to 250%, a green background segment becomes visible. To witness this anomaly, refer to the video demonstration linked below. The following source code is extracted from the showcased video. Could this discrepancy be attributed to a browser rendering glitch or a flaw in my code?

  • Operating System: Windows 10, Version 10.0.18362, 64-bit
  • Browser: Google Chrome, Version 75.0.3770.100, 64-bit

Video Link: https://youtu.be/uwAEixLBUeU

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>index</title>
    <link href="https://fonts.googleapis.com/css?family=Montserrat:400,700&display=swap" rel="stylesheet">
    <style>
        html, body { margin: 0; border: 0; padding: 0; font-family: 'Montserrat', sans-serif; font-size: 1em; line-height: 1.2; color: #222; }
        html { background: #bbb; }
        body { width: 1000px; margin: 0 auto; background: #fff; }
        a { text-decoration: none; }

        .modelerInputReport {
            overflow: hidden;
            padding: 5px;
        }

        .modelerInputReportDiv {
            float: right;
        }

        .modelerInputReportDiv span {
            display: inline-block;
        }

        .modelerInputReportDiv button {
            vertical-align: middle;
            cursor: pointer;
            font-weight: bold;
            padding: 8px;
            color: #fff;
            border: 1px solid #ccc;
            background: #0066cc;
            margin-left: 5px;
        }


        .modelerInputReportDiv button:hover {
            border: 1px solid #1B273F;
        }

        .modelerInputReportDiv button:active {
            background: #cc7600;
            border: 1px solid #402400;
            box-shadow: inset 0 0 10px 2px #402400;
        }
    </style>
</head>
<body>
    <div class="modelerInputReport">
        <div class="modelerInputReportDiv">
            <span id="modelerInputReportMsg">(generate to unlock) -</span>
            <span>Report:</span>
            <button id="modelerInputReportPrint" class="modelerInputReportPrint">PRINT</button>
            <button id="modelerInputReportDownload" class="modelerInputReportDownload">DOWNLOAD</button>
        </div>
    </div>
</body>
</html>

Answer №1

In my experience, this issue could be considered a unique rendering characteristic rather than a technical 'bug'. When adjusting the zoom level of a document, the browser is tasked with scaling a '1px' border to a different width in pixels. At times, this may not result in a whole number of pixels, prompting the browser to apply anti-aliasing or round widths accordingly. Such adjustments are necessary whenever there is a fractional pixel value on the screen, particularly noticeable at high-zoom levels. However, for most situations, this is typically not a significant concern.

If this poses an issue in your circumstances, there are strategies that can be implemented to mitigate the impact:

  • Utilize non-pixel measurements like border: 0.1rem solid #CCC
  • Modify how the background is rendered by introducing spacer elements between buttons and coloring them, while keeping the container element's background consistent with its border color.
  • Experiment with slight margin, transform, or position adjustments (0.5px - 1px) to slightly overlap the element over the border.

These methods aim to manipulate the browser's rendering process to better suit your specific scenario, although it's uncertain if they will resolve the issue entirely. It's important to note that these adjustments might lead to undesired effects in other browsers and operating systems as well.

TL;DR - Addressing this issue ultimately depends on whether it significantly impacts functionality!

Answer №2

There seems to be an issue with display:inline-block; as it adds some spacing. Try using float: left instead of display: inline-block.

Here is the suggested CSS:

.modelerInputReportDiv span {
     float:left;
}
.modelerInputReportDiv button {
     float:left;
     vertical-align: middle;
        cursor: pointer;
        font-weight: bold;
        padding: 8px;
        color: #fff;
        border: 1px solid #ccc;
        background: #0066cc;
        margin-left: 5px;
}

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