What are the differences in rendering between Almost Standards Mode and Standards mode?

After researching extensively, I have found that the main difference between almost standards mode and standards mode is related to image alignment in table cells.

However, a particular question on Internet Explorer 8 and Checkbox CSS Problem, has pointed out that there are differences in how IE8 and Opera render checkboxes in these two modes. Interestingly, this discrepancy exists even though tables and images are not present on the mentioned page.

Considering this new information, are there any other variations between almost standards mode and standards mode?

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Answer №2

In the original almost standards mode, only images in tables were affected. However, browsers that adopted this mode may have introduced other differences as well.

Form fields, particularly checkboxes, pose a challenge because the standards do not provide clear guidelines on how they should be displayed. As a result, it is largely left to the browser to determine how to render them effectively. Checkboxes are inline elements like images, so some browsers might treat them similarly to images.

Answer №3

This informative Microsoft resource delves into the nuances between images and baselines, shedding light on the behavior of checkboxes that sparked this inquiry:

For further insights, visit: http://msdn.microsoft.com/en-us/library/ff405794%28v=vs.85%29

In Almost Standards mode, it is highlighted that:

Inline elements play a role in line height if any of the following conditions apply:

If the element:

  • Contains textual characters

  • Features a non-zero border width

  • Includes a non-zero margin

  • Incorporates a non-zero padding

  • Possesses a background image

  • Utilizes vertical-align with a value divergent from baseline

Please note that a line break does not qualify as a textual character under these criteria unless it stands as the sole content within a line box. In such instances, the line box height comprises the highest inline box top and lowest inline box bottom within the line, irrespective of the specified line height.

If an image element constitutes the solitary content within a table cell, the line box height for said cell is appropriately adjusted to zero.

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