Summarize a detailed description of the prevention methods for some common problems

Boundary overlap refers to two or more boxes (which may or may be nested) adjacent boundaries (in which there is no non-empty content, padding, borders) coincident together to form a single boundary. The vertical adjacent boundary of two or more block-level boxes is coincident. The boundary width of the result is the largest value in the width of the adjacent boundary. If there is a negative boundary, the maximum negative boundary of the absolute value is subtracted from the largest positive boundary. If there is no positive boundary, the maximum negative boundary of the absolute value is subtracted from zero.　　Note: Adjacent boxes may not be generated by the elements of a parent-child or sibling relationship.　　However, there are exceptions to the overlapping boundaries: 1. The horizontal margin will never overlap. 2, in the specification document, 2 or more block-level box models adjacent to the vertical margin will overlap.　　　　The final margin value is calculated as follows: A, all are positive, take the largest, B, not all positive, then take the absolute value, then use positive values minus the maximum, C, no positive, then take the absolute value, and then use 0 minus the maximum. Note: Adjacent box models may be dynamically generated by DOM elements and are not

1. CSS margin overlap and prevention methods

Summary: Boundary overlap is a single boundary where two or more boxes (which may or may be nested) are adjacent to each other (without any non-empty content, padding, borders) coincident together. The vertical adjacent boundary of two or more block-level boxes is coincident. The boundary width of the result is the largest value in the width of the adjacent boundary. If there is a negative boundary, the maximum negative boundary of the absolute value is subtracted from the largest positive boundary. If there is no positive boundary, the maximum negative boundary of the absolute value is subtracted from zero. Note: Adjacent boxes may not be generated by the elements of a parent-child or sibling relationship.

2. PHP SQL injection and anti-injection classic case Study _php tutorial

Introduction: PHP SQL injection and anti-injection classic case analysis. For SQL injection and anti-injection is actually an attack and defense, today we want to tell you the most basic injection and prevention methods, the principle is to take advantage of PHP or MySQL some features and we did not note

3. Linux prevent PHP forgery local file resolution _php tutorial

Description: Linux prevents PHP from forging local file resolution. We are only talking about Linux systems, but to prevent the method in any system is valid, let us first look at such operations you can use the code as follows copy code HTTP://WWW.XX

4. Linux prevents PHP from forging local file resolution methods

Description: Linux prevents PHP from forging local file resolution. We are only talking about Linux systems, but to prevent the method in any system is valid, let us first look at such operations you can use the code as follows copy code HTTP://WWW.XX

5. Linux prevents PHP from forging local file resolution methods

Introduction: We only talk about Linux system, but prevent the method in any system is effective, the following we first look at such operations, you can use, the code is as follows: http://www.phprm.com/index.php?page=../e ...

6. PHP SQL injection and anti-injection classic case study

introduction: For SQL injection and anti-injection is actually an attack and defense, today we want to tell you the most basic injection and prevention methods, The principle is to take advantage of some of the features of PHP or MySQL that we are not aware of. A simple SQL injection attack case if we have a public ...